RE: Tyre pressure

R1200RS + R1250RS Forum � 1200 RS technology � General topics � Tyre pressure

Page 6 of 6 � Page 1 2 3 4 5 6 Page �

Topic settings

Print view

Jump to forum

RS-Forum New Member Introductions Forum operation, design and help guest area My ride tour reports in planning training and coaching 1200 RS technology General topics Exhausts and Engine Tyres, Brakes and Suspension Tuning and modding Electronics Warranty stuff 1250 RS technology General topics Exhausts and Engine Tyres, Brakes and Suspension Tuning and modding Electronics Warranty stuff RS equipment Navigation accessories clothing and helmet What have you done to bike Knowledge Base Knowledge Base - how it works Knowledge Base Meeting Thread RS worldwide regions Africa Asia Australia Canada Europe Europe UK Middle East South America USA Midwest USA Northeast USA Southeast USA Southwest USA West RS Lounge Area Off Topic Other Bikes buy and sell forum rules

#76 | RE: Tyre pressure datum

Tue Dec 26, 2023 4:02 am

BMW has a very clear methodology for setting tire pressure. It's in the manual. And it works. Consistent pressures, corrected for temperature, are easy to achieve.

reply

#77 | RE: Tyre pressure datum

Tue Dec 26, 2023 11:07 am

I went to check my mom�s tire pressure the other day. Her air gauge is the same make and model as mine, but I noticed it read about 2-3 pounds higher than mine. Not a deal breaker, but this was a higher quality model. Makes me wonder if hers is messed up, mine, or both are off.

I�m a Notary Public. RESPECT MY AUTHORITY!

reply

#78 | RE: Tyre pressure datum

Tue Dec 26, 2023 1:55 pm

Zitat von paleolithictech im Beitrag #75
good point Lee ..... But I'm sure any tire has a projected hot pressure, if you can get the info. I'm pretty sure this is also similar to how motogp works with tire pressure.. As you heard motogp started checking pressures on the starting line as it was thought the teams were lowering pressure too much to account for excess heat. Hickman received a penalty for too low of pressure but it was only tenths of a pound but cost him a lot.
But I do plan to check the hot temps just to see what the tires are doing, over the course of seasons .... the pressure might not matter a lot with the auto suspension ...

The flexing and rubbing of the tire plies generate heat. Therefore, the highest temps are near the inside of the tire and below the thickest tread. As the tire wears, there's less tread material to act as insulation and the tire tends to run cooler.

TPS takes care of all this using the simple formula, Pressure / Temperature = constant. In the case of your BMW, the owner's manual specified pressure corresponds to 20C. Since the amount of heating depends on the amount of flexing (cold tire pressure) and the tire condition (amount of tread), you're just guesstimating without a temperature measurement.

Old Forum Orphan

reply

#79 | RE: Tyre pressure datum

Tue Dec 26, 2023 2:12 pm

Zitat von zer0netgain im Beitrag #77
I went to check my mom�s tire pressure the other day. Her air gauge is the same make and model as mine, but I noticed it read about 2-3 pounds higher than mine. Not a deal breaker, but this was a higher quality model. Makes me wonder if hers is messed up, mine, or both are off.

I use a fluid-filled industrial gauge as a standard and mark the difference (from the "standard") on the backside of my tire gauges. Over several years, the offset/difference/variation hasn't changed for my various gauges. One cheap ($5) gauge reads 2 psi high at 40 psi. That's the worst one I have.

I select 0 to 60 psi (4 bar) tire gauges so the measurements are in the higher accuracy mid-range of the gauge.

Old Forum Orphan

reply

MotoGP 2022 � � R1250RS Engine spoiler instructions - help needed

Page 6 of 6 � Page 1 2 3 4 5 6 Page �

RE: Tyre pressure - 6