Tire Air Pressure? - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 20 Old 05-23-2005, 08:06 PM Thread Starter
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Tire Air Pressure?

Hey Gang

Well, This seems like the most mundane of questions but .. What Tire Pressure are you running on your DL-650's ?

This has been my formula so far.

I have been running exactly what it says on the chain guard.
Solo Riding
33 Front
36 Rear
I am 240 lbs and I ride pretty average.. ( not too fast in the corners )

I got 6445 miles out of my Rear TrailWing and switched to a Metz. Tourance.
Now at 7800 Miles, I just ordered a new Front Metz. Tourance.
I have about another 200 miles or so on the front but it's burning fast..
so call it 8000 for the front..

Is that about right for the trailwings? or did I burn them out early?


anyway:

A few folks I have spoken too said they run 40 PSI in the rear..
and higher than documented in the front too.

So I want to know what do you do.. and WHY?
Will I get longer life out of my tires by running a few more pounds of air?
or Less?


Is there a formula for calulating my weight and the bike .. to come up with the right pressure for me?

Is there some science out there instead of just speculation and rumor?

Thanks
Dudes

also:
I ordered a new Helmet too Scorpion EXO-700.. I'll post a review soon :twisted:


CHRIS!
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04 DL-650
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post #2 of 20 Old 05-23-2005, 09:02 PM
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I weigh in at 150lbs. and have been running my DL1000 at 36-37 front and 38-39 in the rear. I got about 8300 miles out of the Trailwing rear and the Tourance went about 13,000 miles. The BT020s on it now are at about 7000 miles and the rear is getting flat in the center.

Dave
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post #3 of 20 Old 05-23-2005, 11:59 PM
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I run 40psi front and 42psi rear, whether solo or two-up. 4000km and no real wear showing on either tyre. There's no science that I'm aware of, but general rule of thumb for me is to go 4-6psi higher than the maker recommends (I do this on my cars too.) The reason for going a little more than that with the front is due to advice taken from this site regarding premature tyre wear if run lower than 38psi. As air is free anyway, just have a bit of an experimient and see what feels best for you!

DL650 K5, Staintune pipe, topbox, Powerbronze bellypan, Givi E21's, Suzuki handguards
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post #4 of 20 Old 05-24-2005, 07:31 AM Thread Starter
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Thanks Barney...

I would imagine a harder front tire would corner quicker too, aye?
or atleast feel that way..

who else ?

04 DL-650
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post #5 of 20 Old 05-24-2005, 10:28 AM
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36/42 for me.
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post #6 of 20 Old 05-24-2005, 10:18 PM
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There is some science to the proper inflation of motorcycle tires. What it comes down to is whatever pressure you are riding at, after at least of 30 minutes of high speed riding if the tire pressure has gone up more than 10% of the original pressure, you are riding at too low of a cold pressure. If the tire pressure hasn't changed your riding at too high of a cold pressure. If your within the 10% your cold pressure is just right.

What you are striving to find is the pressure at which the tires heat build up doesn't go above the design elements of the tire, but which will also heat the tire to the correct level for maximum traction and life.

This is a bit of a pain to figure out because it is not a straight rate scale, if for example your cold pressure is 30lb and after 30 minutes of high speed riing your pressure climbs to 35lb's, this doesn't mean you add 2lb's to the cold pressure to get within the 10%. This may take a couple days to figure out exactly as you should start always with cold tires and will change based on the load on the bike.
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post #7 of 20 Old 05-26-2005, 07:34 PM Thread Starter
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Hey Brad
Well thats pretty cool

I tried it today
Cold Started at Rear 40, Front 38


Came home 45 mins later HOT..Rear 45.5, Front 42.

So, my expansion was

Rear 12%
Front 9.5%
Any math wizzez out there feel free to correct me

So..... Maybe I just need to add a tiny bit more to meet your equation...

Pretty cool

I'll continue my research and report back

SO If I was running at the prescribed pressure that Suzuki Advises (33F/36R) I can only ASSume I was underutilizing the tire? Is that right?

Thanks Man

Chris

04 DL-650
Have a good time, ALL the time !
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post #8 of 20 Old 05-27-2005, 12:32 AM
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The primary reason many people get very low mileage out of oem tires is due to following a pressure recommendation that is too low. And/or not bothering to check their tire pressures and riding at too low of a point.

This is particulary true on bikes designed or expected to be used on and off the pavement, the manufacturer will try to cover all conditions with the recommended pressures. This middle of the road recommendation (pun intended) doesn't do anything for long life or for the sharpest handling on the pavement.

Just remember that higher pressures may well be better on a road with great traction, dry, no loose stuff, etc. but traction will drop in those areas with the less than perfect conditions, so be safe, and fast!
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post #9 of 20 Old 05-29-2005, 05:36 PM
soboy
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I am currently running 37 front, 40 rear. Seems to corner very well at these settings, almost sportbike-like. Much better than the stock 33/36.
post #10 of 20 Old 05-30-2005, 07:50 AM
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I think you are better off following the pressures listed on the tires than on the bike.

Yes I ran the Deathwings at the recommended pressures but when I switched to ME 880s I tried 40/42 as recommended by some one else.

The rear was running hot so I bumped tham up to max on the rear [50lbs] on that tire and they ran cool.

My personal thing is to run ALL tires at the max on the sidewall for better wear. You might find the ride a bit harsh.
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