PSI Tire Mfg recommendations vs Motorcycle Mfg - BMW R1200GS Forum : R1200 GS Forums
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post #1 of 10 (permalink) Old 23-Apr-2019, 07:08 AM (505) Thread Starter
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PSI Tire Mfg recommendations vs Motorcycle Mfg

Hi all,

Have Continental tires. 42 PSI noted on front tire. I believe BMW recommends 36 PSI on the front. Which one do you usually go with?
Thanks in advance.
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post #2 of 10 (permalink) Old 23-Apr-2019, 08:34 AM (565)
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The psi on the side of the tire is the maximum pressure you can run on that tire without doing damage to it. What BMW recommends is the pressure they want you to put in your tires for your particular bike. So use what BMW says as long as it doesn't go over the limit that is posted on the tire. (It's the same with your car tires)
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post #3 of 10 (permalink) Old 23-Apr-2019, 11:20 PM (181)
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36-42

I use the on board tyre pressure read out, and set the tyres to 36 psi front, and 42 psi rear.
My digital gauge tells me that it is actual 3psi higher, but that has worked for me for long enough to leave it alone.
I get on average 14000 km on the rears, and change two rears to one front.
No signs of irregular wear in over 300000 km of riding this way.
Michelin Pilot Road 4 front and back.

Graham Day. Sydney Australia
2005 R1200GS 93,000km (Stolen)
2004 R1200GS. 88, 000 km
2007 R1200GS. 34000 km.
current bike. 2010 R1200GS. 83000 km and going as good as new.
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post #4 of 10 (permalink) Old 23-Apr-2019, 11:24 PM (183)
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max air = max load

Quote:
Originally Posted by Rick92040 View Post
The psi on the side of the tire is the maximum pressure you can run on that tire without doing damage to it. What BMW recommends is the pressure they want you to put in your tires for your particular bike. So use what BMW says as long as it doesn't go over the limit that is posted on the tire. (It's the same with your car tires)

That number is a load index. basically more load, needs more air. BMW make those tyre pressure recommendations based on the load of the bike and rider.
If you load your bike up heavy, then increase the tyre pressure.
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Graham Day. Sydney Australia
2005 R1200GS 93,000km (Stolen)
2004 R1200GS. 88, 000 km
2007 R1200GS. 34000 km.
current bike. 2010 R1200GS. 83000 km and going as good as new.
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post #5 of 10 (permalink) Old 24-Apr-2019, 06:27 AM (477)
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Quote:
Originally Posted by Rick92040 View Post
The psi on the side of the tire is the maximum pressure you can run on that tire without doing damage to it. What BMW recommends is the pressure they want you to put in your tires for your particular bike. So use what BMW says as long as it doesn't go over the limit that is posted on the tire. (It's the same with your car tires)
One caveat: BMW's recommended pressures assume you are running the tires BMW installs at the factory. If you are running some other tires, you may find that moving up or down a bit improves the tire's performance, feel and/or life. I suspect this has to do with things like sidewall stiffness (e.g., the bias-belted Heidenau K60s Scouts have a very stiff sidewall, while a street-oriented radial might have a much more flexible sidewall) and cross-sectional profile (softly rounded, more pointed, etc.). This forum, ADV Rider, etc., are full of discussions and recommendations from people who've found their own favorite pressure for a particular tire. But the pressures in the manual are a good starting point.

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post #6 of 10 (permalink) Old 24-Apr-2019, 07:37 AM (526)
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All you ever wanted to know about understanding sidewall markings: https://www.discounttire.com/learn/r...-tire-sidewall

The 42 PSI that you see on almost all motorcycle road tires is the maximum safe pressure at 20 degrees centigrade (~ 70 F) at which the tire can be run. It is also the pressure at which the load rating is established.

It is interesting that BMW recommends 42.6 PSI on the rear for a tire that is rated for 40 PSI max.

Kevin
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post #7 of 10 (permalink) Old 25-Apr-2019, 08:51 AM (577)
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Quote:
Originally Posted by Pterodactyl View Post
It is interesting that BMW recommends 42.6 PSI on the rear for a tire that is rated for 40 PSI max.
I have Karoo 3's, the rear side wall max pressure is 38psi, BMW recommends 40psi. If you go to the Metzler website and look up your bike/tire combo in their technical data book for 2019, Metzler recommends 40psi for a tire rated at 38psi.

https://www.metzeler.com/en-us/produ...ical-data-book

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post #8 of 10 (permalink) Old 25-Apr-2019, 02:18 PM (804)
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Originally Posted by Candubrain View Post
I have Karoo 3's, the rear side wall max pressure is 38psi, BMW recommends 40psi. If you go to the Metzler website and look up your bike/tire combo in their technical data book for 2019, Metzler recommends 40psi for a tire rated at 38psi.

https://www.metzeler.com/en-us/produ...ical-data-book
Well that is a puzzler.

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post #9 of 10 (permalink) Old 25-Apr-2019, 04:21 PM (890)
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Quote:
Originally Posted by Pterodactyl View Post
Well that is a puzzler.
Actually I made an error Metzler recommends 42psi or 2.9 Bar, which is what BMW recommends

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post #10 of 10 (permalink) Old Today, 04:34 PM (899)
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I contacted Metzeler reguarding the Karoo 3s with 38 psi marked on the rear tire sidewall, vs BMW recommending 42psi and Metzler's Technical Data book saying 42psi as well.

A few emails went back and forth, in the end they had to run my query up the chain of command as they were stumped by the contradiction.

Here is their reply:

Please adhere to vehicle manufacturer specification of 36 front and 42 rear.
We listed 38 psi max due to the tires being designated M+S (Mud and Snow), but since the Karoo 3 is T speed rated tire please adhere to the 118 mph maximum speed rating.

Kindest regards,
Metzeler team


Still don't get it, but my rear is now pumped to 42psi.

brian

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