Another Tyre Pressure Question...... - MVAgusta.net
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post #1 of 22 (permalink) Old 05-06-2016, 03:03 PM Thread Starter
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Another Tyre Pressure Question......

Sorry guys, I know this has probably been done to death by now, but I can't find the info I'm looking for.

I have a Brutale 750 and it has set of Maxxis Supermaxx Sports fitted at the moment. I checked the pressures today and they are 32psi Front and 38psi rear. The manual says I should have 33 front and rear. I understand that manufactures have their own specs for tyres but I can't seem to find the specs for Maxxis. is 32/38 OK?

I am new to riding so forgive my ignorance, but I am not really sure how running higher psi affects the grip/handling compared to what the manual says.

Thanks
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post #2 of 22 (permalink) Old 05-06-2016, 04:07 PM
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Usually, a tire manufacturere will default to the bike manufacturer specs. This is also true of car and truck tires.

I would run 33/33.

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post #3 of 22 (permalink) Old 05-06-2016, 08:28 PM
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I run 33/33, but it seems the pressure goes up to 35-37 when they are hot. Its normal I guess, taking into account heat and air expansion and what not... So after 5 mins of ridding you are not really at 33 but a higher PSI.

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post #4 of 22 (permalink) Old 05-07-2016, 03:23 AM Thread Starter
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Mine were cold when I took the reading so I wonder what they reach when hot... I'll maybe drop the to 33/33 and see how goes. I guess I can away pump them up if I don't like it!

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post #5 of 22 (permalink) Old 05-07-2016, 07:37 AM
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Unless you are racing, or doing a track day, your tire pressure should always be measured cold.

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post #6 of 22 (permalink) Old 05-07-2016, 08:07 AM
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Is it right that 33 psi is about 2.2 bar? Seems low to me. I run a bit more.

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post #7 of 22 (permalink) Old 05-07-2016, 08:10 AM
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33 psig = 2.27527 bar

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post #8 of 22 (permalink) Old 05-07-2016, 12:25 PM
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Originally Posted by Maximum Velocity View Post
Is it right that 33 psi is about 2.2 bar? Seems low to me. I run a bit more.
33 is what it says on the sticker on the fork. And in the book.
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post #9 of 22 (permalink) Old 05-10-2016, 02:08 AM
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The sticker is only an indication and probably related to the OEM tyres not the tyres you replace them with. Tyre pressure for a road bike is measured cold. The best source for the tyre pressure is the tyre manufacturer and should take into account your weight (including luggage and pillion where applicable) and the ambient air temperature (tyre pressure will be different on a sunny 30+ day to a wet 10 day). The rear tyre is usually a higher pressure than the front for road use but the opposite for track days. The tyre pressure is determined, in part, to provide 'strength' to the side wall which in turn effects the tyre contact patch/handling/temperature. For most riders having a 'fun' ride around a favorite twisty (in other words there are chicken strips on the rear tyre) a variation in tyre pressure by 1 psi will not be noticeable or have any detrimental effect on the handling (suspension and relaxed riding is more important).
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post #10 of 22 (permalink) Old 05-10-2016, 02:33 AM Thread Starter
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Thanks for the responses guys. I set the pressure to 33/33 and went for a 200mile run with some friends to Aviemore and back. The temp was 20+ and there was some spirited riding involved and the bike felt fine. I am running the maxxis supermax sports that were on the bike when I bought it. I looked for maxxis specs but can't seem to find them. But all seems well for the moment.

Thanks again


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