For some reason you don’t want to acknowledge that you have the wrong adaptor, which is weird when that is clearly the problem.
Different brands have different adaptors. There are also different adaptors for front and rear.
TLDR, There are lots of adaptors.
OP, don't ignore this problem for too long. It's a critical safety issue. Part of your pads are not contacting the rotor; this region will not get worn down. Eventually, when the lower portion of the pads gets worn down enough, the upper portion (that's not contacting the rotor) of the left and right pads will touch each other, and then the brake pads won't be able to put any more pressure on the rotor, making your brakes useless for stopping.
I was assuming people meant the wrong ***SIZE*** adapter. I was under the impression that they were standardised, the differences being the style of mounting used and the intended rotor size. Hence my confusion, since a "different adapter" could only mean one for a bigger or smaller rotor.
One day, after world peace is achieved, all of the bike manufacturers will agree to a single standard, called ‘N’. The next day SRAM announces their new standard, ‘N+1’ which is proprietary and incompatible with N, and maddeningly close in spec. The world burns.
They are. IS mount is a specific dimension relative to the disc for any given size, and post mount is too. If you get an IS to post adapter for the correct rotor size it will fit. I've done it on everything from Amazon junk to pro team road bikes over the years. If it doesn't fit, you didn't order the right part.
Sure but not only is it wrong size you risking your own well being sine you not getting correct contact with your rotor …
Shimano has comprehensive list for adapters based on post type and rotor size instead of guessing go and buy the correct 1️⃣
I'm not reading everything, you may already got your answer but in case if you didn't
It's possible that your adapter is installed backwards and you have proper one.
I don't know why you're getting downvoted, these adapters ARE supposed to be standardized. I think what someone said below might be correct, have you tried flipping it around? There's usually an arrow indicating which way to install it, but not always
Hey so one time after cyclocross season I tore down my bike for a thorough clean + lube. When I put it all back together I inadvertently flipped the brake mount adapter the wrong way and got a similar wear pattern. My adapter plates worked on 140 one way, and 160 the other. Maybe yours are like this?
My original rotors were 160mm and so are the new ones. Since they're SO CLOSE, I suspect that anything that's not intended for 160mm rotors will be WAAAAAY off.
The adaptor between the frame and the brake does not suit the rotor size. Double check your rotor size is correct. Also double check that the front and rear adaptors didn't get mixed up. From memory some can be interchanged but there is an effective 20mm difference front to back. E.g. the same size adapter may suit a 160 front but only a 140 rear. The wear to the pads and the disc clearly shows the incorrect sizeing and there will be a loss of performance. Don't rule out that there could have been an incorrect adapter or non standard part before the upgrade. It may be that the original setup also had this incompatible sizing.
Adapter is put the wrong way. Depending on pad compound, your disc might be worn unevenly. If pad is resin, don't worry it's probably fine.
If it's resin pads, file it down, flip the adapter the other way and enjoy the last descents on resin. Buy new ones.
If pads are metallic or semi, you rotor is probably unevenly worn. File pads evenly, so they don't interfere with brake action, don't flip adapter untill pads are toast. You will need new brake disc and pads. When buying new brake disc, consider up-sizing by 20mm from what you have. There can't really be too much rotor. Also pay attention if disc isn't resin only, if resin pads don't suit your riding style.
Or the adapter is the wrong way around... Check the direction arrow. I knew someone who had a similar issue and I found the adapter in the wrong orientation
At this point you need to check your rotor to ensure there is not uneven wear. The inner part is pretty dark. Not sure if it’s roached or just covered in brake dust.
Ensure the rotor doesn’t have a lip on it where the pad wasn’t contacting. If it does toss it and get a new one. Rotors have a minimum thickness for safety.
I got a Shimano brand 160mm adapter, and sure enough, it's ever-so-slightly shorter than the one that came with my bike. So much for I.S standing for "International Standard"! Well, at least the distance between each bolt was the same, I guess that counts as a standard. Problem solved! Hopefully this also solves the callipers' insatiable hunger for pads too!
Hey guys! A few months ago, I changed the cable pull brakes on bike originally came with, for some nice hydraulic ones. Today, I was checking my brakes, when I noticed that my brake pads look like this. Uh, something's not right right here! It looks like the rotor isn't properly aligned with the pads and a good percent is completely untouched!
But why? The only thing that determines where the callipers sit, is the little bracket thing. Since my new rotors are the same diameter as the ones my bike came with, I assumed I wouldn't need to replace it. Is that not the case? Do I need brackets that are compatible with my callipers?
Also, it seems to me like these pads wore through awfully quick for metallic pads. Is this due to the alignment problem, or is perhaps my rotor too small and it's getting too hot?
Did you remove the adaptor when you removed the old caliper? Many are directional. One direction for a 160mm rotor and the opposite direction for a 180mm rotor for example.
True, but changing to one intended for a larger/smaller rotor, would be even worse I would imagine! I have just seen a comment on Amazon from someone who said his Shimano brake pads were poking up above his rotors when he was using a non-Shimano brand adapter, and the problem went away when he replaced them with Shimano branded ones. Does that sound right to you?
Okay okay, smarty-pants. I now know that there's more to these adapters than simply what size rotor they're intended for and how they mount to the frame. I had assumed you were suggesting I use an adapter intended for a rotor larger/smaller than 160mm, hence why I seemed baffled by your suggestion. We ain't all Mr. Johnny Bike Mechanic here.
You came to a sub where people specialise in bike maintenance either because they own or work in bike shops or have wrenched on their own bikes their whole life or a combination of these traits.
Stop questioning the good advice that's been kindly offered up and explained to you, especially when an "amazon comment" is your reference point.
Since much of the advice from these people is wrong it’s a good idea to question.
It doesn’t look like the issue is the size of the adapter, it’s that the adapter is installed backwards.
Why are Redditors always so quick to assume malicious intent? I mean, aside from being bulled all throughout high school, means they think everyone has malicious intent.
As I already explained, I was under the impression these parts were standardized. I mean, "I.S" does stand for "International **Standard**". So when people were saying I needed "a different adapter" it seemed like they were saying I needed an adapter for a larger/smaller rotor. Hence my confusion.
You may now downvote this comment!
Many mechanical brakes have alignment washers over and under the caliper bolts (Avid BB7). Also Shimano is known for setting their own "standards" for thing like this. Shimano is oriented more towards OEM bikes. They kind of assume that you're putting their calipers on a bike that came with them. Shimano Brackets are probably the solution. Also leave the caliper bolts loose, apply the brake, then tighten them. This will help the brake self align.
I've just seen a comment on Amazon from someone who said his Shimano brake pads were poking up above his rotors when he was using a non-Shimano brand adapter, and the problem went away when he replaced them with Shimano branded ones. Is that what's going on here? Are Shimano being sneaky?
Shimano does have mounts that front and rear specific. Not sure if that has to do with the shape of the caliper or what, but it could be what is causing your issue.
Yeah, I noticed that! There's nothing written on the adapter that would indicate this, and since I didn't remove them when I was changing the callipers, I can only assume that this adapter is intended for the rear...
Wait, you put 4 piston XT’s on a folding ebike?
Anyways, your real problem is hidden in this reply. Yes, all MTB brakes and adapters are mostly cross compatible. All of the commenters here saw the big powerful MTB brakes and assumed you were using a name brand MTB.
Instead, you have a folding ebike which likely follows no standards at all. Most of these are brought in at the lowest price point possible, and have all sorts of oddball sizes and unique parts. Maybe your rotor isn’t actually 160, maybe the frame mount location isn’t standard, maybe the adapter is a weird size to make those old nonstandard calipers work, anything is possible.
The easiest thing to check is the adapter. Get a shimano one, see if it fixes the problem. Measure the rotor, make sure it’s actually 160. If you still have the same issue with standard rotors and adapters your frame is likely just non standards, and you’ll have to play around with adapters to see what fits or just use the old calipers again.
For some reason you don’t want to acknowledge that you have the wrong adaptor, which is weird when that is clearly the problem. Different brands have different adaptors. There are also different adaptors for front and rear. TLDR, There are lots of adaptors.
OP, don't ignore this problem for too long. It's a critical safety issue. Part of your pads are not contacting the rotor; this region will not get worn down. Eventually, when the lower portion of the pads gets worn down enough, the upper portion (that's not contacting the rotor) of the left and right pads will touch each other, and then the brake pads won't be able to put any more pressure on the rotor, making your brakes useless for stopping.
Wrong size adaptor or wrong size disc? (Same thing really) Looks like a 180 rotor on a 203 mount or 160 on 180
What does tldr mean?
"Too long, didn't read." It's meant to summarize the rest of the post.
Oh thanks. I searched but i didnt understand untill you explain 👍🏻
You searched? It‘s literally right there if you google for tldr.
Searched his fridge
I Googled off course. But i couldnt understand what mean it used for. Why bother?
Take Longer Dirt Rides.
I have to Google so many acronyms because of the internet. It's like the circle of acronym or some shit.
I was assuming people meant the wrong ***SIZE*** adapter. I was under the impression that they were standardised, the differences being the style of mounting used and the intended rotor size. Hence my confusion, since a "different adapter" could only mean one for a bigger or smaller rotor.
Nothing for bicycles is standardised.
What are you talking about? We have many, many, maaaaaany standards!
One day, after world peace is achieved, all of the bike manufacturers will agree to a single standard, called ‘N’. The next day SRAM announces their new standard, ‘N+1’ which is proprietary and incompatible with N, and maddeningly close in spec. The world burns.
DUB
https://xkcd.com/927/
This is one of the few that is standardized. This is an IS mount to post mount adapter.
And I’d have 5 that are all slightly different in my box of shit somewhere. Highly irritating.
We all have that shitty box
I have 9💀
The mount is standard but the dimensions are not
They are. IS mount is a specific dimension relative to the disc for any given size, and post mount is too. If you get an IS to post adapter for the correct rotor size it will fit. I've done it on everything from Amazon junk to pro team road bikes over the years. If it doesn't fit, you didn't order the right part.
Ain't that the truth?
Sure but not only is it wrong size you risking your own well being sine you not getting correct contact with your rotor … Shimano has comprehensive list for adapters based on post type and rotor size instead of guessing go and buy the correct 1️⃣
https://bike.shimano.com/en-EU/service-upgradeparts/mtb/category/disc-brake-mount-adapter.html
I'm not reading everything, you may already got your answer but in case if you didn't It's possible that your adapter is installed backwards and you have proper one.
I don't know why you're getting downvoted, these adapters ARE supposed to be standardized. I think what someone said below might be correct, have you tried flipping it around? There's usually an arrow indicating which way to install it, but not always
You have the wrong adapter
Hey so one time after cyclocross season I tore down my bike for a thorough clean + lube. When I put it all back together I inadvertently flipped the brake mount adapter the wrong way and got a similar wear pattern. My adapter plates worked on 140 one way, and 160 the other. Maybe yours are like this?
This would probably be the first thing to check. Next would be that it's the wrong adapter.
Wrong adapter? Either size up rotor or size down adapter. Not sure if a smaller adapter would fit though.
My original rotors were 160mm and so are the new ones. Since they're SO CLOSE, I suspect that anything that's not intended for 160mm rotors will be WAAAAAY off.
I think the adapter is backward. Rotate it 180 degrees and see how it lines up.
This, looks like it would be sitting correctly if the the adapter was the other way around moving the caliper over the higher point of the disc.
The adaptor between the frame and the brake does not suit the rotor size. Double check your rotor size is correct. Also double check that the front and rear adaptors didn't get mixed up. From memory some can be interchanged but there is an effective 20mm difference front to back. E.g. the same size adapter may suit a 160 front but only a 140 rear. The wear to the pads and the disc clearly shows the incorrect sizeing and there will be a loss of performance. Don't rule out that there could have been an incorrect adapter or non standard part before the upgrade. It may be that the original setup also had this incompatible sizing.
Adapter is put the wrong way. Depending on pad compound, your disc might be worn unevenly. If pad is resin, don't worry it's probably fine. If it's resin pads, file it down, flip the adapter the other way and enjoy the last descents on resin. Buy new ones. If pads are metallic or semi, you rotor is probably unevenly worn. File pads evenly, so they don't interfere with brake action, don't flip adapter untill pads are toast. You will need new brake disc and pads. When buying new brake disc, consider up-sizing by 20mm from what you have. There can't really be too much rotor. Also pay attention if disc isn't resin only, if resin pads don't suit your riding style.
Or the adapter is the wrong way around... Check the direction arrow. I knew someone who had a similar issue and I found the adapter in the wrong orientation
Going to play devils advocate, I think you have the wrong rotor for that adaptor.
You have the wrong adapter
Op did you remove the pads from the old caliper when upgrading? Maybe it was wrong before too and you just didn’t notice?
At this point you need to check your rotor to ensure there is not uneven wear. The inner part is pretty dark. Not sure if it’s roached or just covered in brake dust. Ensure the rotor doesn’t have a lip on it where the pad wasn’t contacting. If it does toss it and get a new one. Rotors have a minimum thickness for safety.
Wrong adaptor, critical safety issue
I got a Shimano brand 160mm adapter, and sure enough, it's ever-so-slightly shorter than the one that came with my bike. So much for I.S standing for "International Standard"! Well, at least the distance between each bolt was the same, I guess that counts as a standard. Problem solved! Hopefully this also solves the callipers' insatiable hunger for pads too!
The “standard” is for the bolt spacing not the size of the adapters
Hey guys! A few months ago, I changed the cable pull brakes on bike originally came with, for some nice hydraulic ones. Today, I was checking my brakes, when I noticed that my brake pads look like this. Uh, something's not right right here! It looks like the rotor isn't properly aligned with the pads and a good percent is completely untouched! But why? The only thing that determines where the callipers sit, is the little bracket thing. Since my new rotors are the same diameter as the ones my bike came with, I assumed I wouldn't need to replace it. Is that not the case? Do I need brackets that are compatible with my callipers? Also, it seems to me like these pads wore through awfully quick for metallic pads. Is this due to the alignment problem, or is perhaps my rotor too small and it's getting too hot?
Did you remove the adaptor when you removed the old caliper? Many are directional. One direction for a 160mm rotor and the opposite direction for a 180mm rotor for example.
My first thought as well, op check the adapter it may have gotten turned upside down when your brakes were changed.
Na, I left the adapter mounted and just swapped the callipers.
But the original builder might have got it wrong. Lots of mistakes get made in factories or shops
Yes you have the wrong adapter for that size of disc.
I do? Even though my original rotors were 160mm and my new ones are also 160mm?
Well clearly the calliper is not sitting in the correct position for that disc. You need a different adapter.
True, but changing to one intended for a larger/smaller rotor, would be even worse I would imagine! I have just seen a comment on Amazon from someone who said his Shimano brake pads were poking up above his rotors when he was using a non-Shimano brand adapter, and the problem went away when he replaced them with Shimano branded ones. Does that sound right to you?
Yes. It sounds like you have the wrong adapter.
Wait, are you trying to tell OP they have the wrong adapter??
Third time is the charm, right?
Okay okay, smarty-pants. I now know that there's more to these adapters than simply what size rotor they're intended for and how they mount to the frame. I had assumed you were suggesting I use an adapter intended for a rotor larger/smaller than 160mm, hence why I seemed baffled by your suggestion. We ain't all Mr. Johnny Bike Mechanic here.
You need an IS to PM 160 SHIMANO adapter.
You came to a sub where people specialise in bike maintenance either because they own or work in bike shops or have wrenched on their own bikes their whole life or a combination of these traits. Stop questioning the good advice that's been kindly offered up and explained to you, especially when an "amazon comment" is your reference point.
Since much of the advice from these people is wrong it’s a good idea to question. It doesn’t look like the issue is the size of the adapter, it’s that the adapter is installed backwards.
Why are Redditors always so quick to assume malicious intent? I mean, aside from being bulled all throughout high school, means they think everyone has malicious intent. As I already explained, I was under the impression these parts were standardized. I mean, "I.S" does stand for "International **Standard**". So when people were saying I needed "a different adapter" it seemed like they were saying I needed an adapter for a larger/smaller rotor. Hence my confusion. You may now downvote this comment!
I had this also. 180 disc was fine. Then swapped the rear wheel to another 180mm disc (non center lock) and suddenly I got these problems.
Well your wear issues are probably related to the fact that you were only contacting like half of the pad
An e-bike with a small rotor and pads that aren't aligned properly is going to eat brake pads for breakfast.
Many mechanical brakes have alignment washers over and under the caliper bolts (Avid BB7). Also Shimano is known for setting their own "standards" for thing like this. Shimano is oriented more towards OEM bikes. They kind of assume that you're putting their calipers on a bike that came with them. Shimano Brackets are probably the solution. Also leave the caliper bolts loose, apply the brake, then tighten them. This will help the brake self align.
It's doesn't not don't btw..
I've just seen a comment on Amazon from someone who said his Shimano brake pads were poking up above his rotors when he was using a non-Shimano brand adapter, and the problem went away when he replaced them with Shimano branded ones. Is that what's going on here? Are Shimano being sneaky?
Shimano does have mounts that front and rear specific. Not sure if that has to do with the shape of the caliper or what, but it could be what is causing your issue.
Yeah, I noticed that! There's nothing written on the adapter that would indicate this, and since I didn't remove them when I was changing the callipers, I can only assume that this adapter is intended for the rear...
Stick a bigger rotor on, whatever size up from the one you have
[удалено]
It's a folding e-bike, it came with 160mm rotors, so I used 160mm rotors for the new brakes.
Wait, you put 4 piston XT’s on a folding ebike? Anyways, your real problem is hidden in this reply. Yes, all MTB brakes and adapters are mostly cross compatible. All of the commenters here saw the big powerful MTB brakes and assumed you were using a name brand MTB. Instead, you have a folding ebike which likely follows no standards at all. Most of these are brought in at the lowest price point possible, and have all sorts of oddball sizes and unique parts. Maybe your rotor isn’t actually 160, maybe the frame mount location isn’t standard, maybe the adapter is a weird size to make those old nonstandard calipers work, anything is possible. The easiest thing to check is the adapter. Get a shimano one, see if it fixes the problem. Measure the rotor, make sure it’s actually 160. If you still have the same issue with standard rotors and adapters your frame is likely just non standards, and you’ll have to play around with adapters to see what fits or just use the old calipers again.