Pirelli MT21 Pressures - Kawasaki KLR 650 Forum
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post #1 of 2 Old 09-11-2007, 08:37 AM Thread Starter
 
Join Date: Jul 2007
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Pirelli MT21 Pressures

I had a local shop put on a set of Pirelli MT21s over the weekend in prep for a trip I am going on in a week or so that will involve an undetermined amount of off-road. Better safe than sorry, I figure.

I asked the guy what pressures he used, he said "32R/30F". That seems in the ballpark for street use. I am interested in what to run in them for the highspeed freeway run from San Francisco up to Bear Valley (on highway 4) with my heavy ass and a bunch of camping gear on the bike.

According to the Pirelli USA website, they list 30-36PSI as the MIN-MAX for the front tire and 30-33PSI as the MIN-MAX for the rear. That seems to me like a very high MIN, and a low MAX for the big rear tire. But it checks with what is on the sidewall, the rear says 33PSI max.

I want to air them up hard for the run up there, and if I hadn't researched it I probably would have done something like 36R/32F. Also when I get up there in the rocks and dirt I want to air them down, but my plan of taking them down to 20R/18F seems to be way outside what Pirelli recommends.

Those of you who have used MT21s on a KLR before under similar conditions, what kind of pressures did you find suitable? I don't want knobs falling off the rear before I get to the mountains!
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post #2 of 2 Old 09-11-2007, 02:07 PM
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Quote:
Originally Posted by michaeln View Post

I want to air them up hard for the run up there, and if I hadn't researched it I probably would have done something like 36R/32F. Also when I get up there in the rocks and dirt I want to air them down, but my plan of taking them down to 20R/18F seems to be way outside what Pirelli recommends.
I'd do exactly what you intended to do..

As far as the minimum air pressure, remember that they're expecting some idiot who isn't smart enought to air his own tires back up to operating pressures when he returns to running down the road.

The pressures you mention are EXACTLY what I typically run, and I have run those pressures on MT21's on my old XR650L.

From your post it's very easy to tell that you're knowledgable of what you're expecting out of the tires when you consider the conditions. I'd run em' where you want them for off-road, and air em' up for the trip home.
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