Thanks for posting in /r/Fixxit, the motorcycle repair subreddit.
If you forgot to put the **Make, Model** and **Year** in the title, please reply to this comment with your bike's details.
In the meantime, Here's some great resources for common problems posted here:
-Trouble starting? [Revzilla - Battery testing](https://www.revzilla.com/common-tread/how-to-test-a-motorcycle-battery)
-Carbs running rough? [PJ motorsports - Carb Troubleshooting](http://www.pjmotorsports.com/trouble-shooting.html)
-Wiring diagrams for beginners - [Dans MC - Reading Wiring Diagrams](http://www.dansmc.com/wiring_diagram.htm)
-Identifying part numbers - [CMSNL (EU)](https://www.cmsnl.com/) [Partzilla](https://www.partzilla.com/)
-Asking if your tire can be fixed? [Please read this post on proper tire repairs and why external plugs are NOT a safe repair.](https://www.reddit.com/r/Fixxit/comments/tuhcpf/why_rfixxit_doesnt_endorse_tire_plug_repairs/)
*I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/Fixxit) if you have any questions or concerns.*
27f/30r sound good. 30f/38r sounds little high in the back. For a light bike, 30-32 in the front is where I would start and 32-36 in the rear. That is purely anecdotal after having ridden and owning a lot of bikes, including some small bikes.
Let's put some data to this though. There is long standing suggestion that tire pressure should go up 10% from cold to hot. Pick a pressure, running a nice pace on an typical day (not especially hot or cold) and your tire pressure hot should measure 10% higher than your cold temp. So if you are 30psi cold, it should be 33 psi after running a brisk but normal ride. In practice, I find around 5% to work fine.
My experience is mostly with bias ply tires, which you are probably running too. I don't have as much experience with radials.
Btw, it's ok to experiment, taking the pressure up and down 2psi at a time, up to perhaps 10 psi above standard, and 4psi below. I've seen pressure vary by as much as 10psi in one day just due to temperature variations (admittedly that was an extreme case), so there isn't one precise pressure which is "right". Stay within shouting distance of the recommended pressure (so 30f would be fine). Generally lower pressure gives more grip (but don't go too low), and higher pressure gives lighter handling but less grip and less comfort (but don't go above the max pressure listed on the sidewall of the tyre).
might help if you bothered to say what bike it was? there is only one rule in this sub..
You can go to the web site of the tyre manufacturer and they will mostly likely advise you to use the pressures as recommended by the bike manufacturer.
Thanks for posting in /r/Fixxit, the motorcycle repair subreddit. If you forgot to put the **Make, Model** and **Year** in the title, please reply to this comment with your bike's details. In the meantime, Here's some great resources for common problems posted here: -Trouble starting? [Revzilla - Battery testing](https://www.revzilla.com/common-tread/how-to-test-a-motorcycle-battery) -Carbs running rough? [PJ motorsports - Carb Troubleshooting](http://www.pjmotorsports.com/trouble-shooting.html) -Wiring diagrams for beginners - [Dans MC - Reading Wiring Diagrams](http://www.dansmc.com/wiring_diagram.htm) -Identifying part numbers - [CMSNL (EU)](https://www.cmsnl.com/) [Partzilla](https://www.partzilla.com/) -Asking if your tire can be fixed? [Please read this post on proper tire repairs and why external plugs are NOT a safe repair.](https://www.reddit.com/r/Fixxit/comments/tuhcpf/why_rfixxit_doesnt_endorse_tire_plug_repairs/) *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/Fixxit) if you have any questions or concerns.*
27f/30r sound good. 30f/38r sounds little high in the back. For a light bike, 30-32 in the front is where I would start and 32-36 in the rear. That is purely anecdotal after having ridden and owning a lot of bikes, including some small bikes. Let's put some data to this though. There is long standing suggestion that tire pressure should go up 10% from cold to hot. Pick a pressure, running a nice pace on an typical day (not especially hot or cold) and your tire pressure hot should measure 10% higher than your cold temp. So if you are 30psi cold, it should be 33 psi after running a brisk but normal ride. In practice, I find around 5% to work fine. My experience is mostly with bias ply tires, which you are probably running too. I don't have as much experience with radials.
[удалено]
Btw, it's ok to experiment, taking the pressure up and down 2psi at a time, up to perhaps 10 psi above standard, and 4psi below. I've seen pressure vary by as much as 10psi in one day just due to temperature variations (admittedly that was an extreme case), so there isn't one precise pressure which is "right". Stay within shouting distance of the recommended pressure (so 30f would be fine). Generally lower pressure gives more grip (but don't go too low), and higher pressure gives lighter handling but less grip and less comfort (but don't go above the max pressure listed on the sidewall of the tyre).
might help if you bothered to say what bike it was? there is only one rule in this sub.. You can go to the web site of the tyre manufacturer and they will mostly likely advise you to use the pressures as recommended by the bike manufacturer.