On my JB's I run 80/65 and feel very comfy.  I'm still at winter weight of 230.

Kelly

Sent from my iPhone

On Mar 24, 2011, at 3:38 AM, Earl Grey <earlg...@gmail.com> wrote:

> Rene,
> 
> thanks for that. Very cool. Something worth mentioning is that the
> total weight should (I assume) include the bike as well, in case that
> isn't clear from the "rider and all gear" description.
> 
> Using this calculator with 40mm tires I indeed end up with numbers
> (34/43 psi fr/rear) about 10 psi higher than what I run off-road (for
> more traction), and about 5 psi higher than what I use on-road (30/35
> psi fr/rear). However, the values it gives me for 33mm tires (Jack
> Brown Greens) are much higher than what I run: 48/61 psi versus the
> 35/40 to 40/45 psi I usually use.
> 
> Cheers,
> 
> Gernot
> 
> 
> On Mar 24, 12:24 am, Rene Sterental <orthie...@gmail.com> wrote:
>> Someone created and posted the following calculator a while back and I find
>> it the best and most flexible. It's also based on Jan's optimal tire
>> deflection for the optimal pressure and you can fully fine tune it.
>> 
>> René
>> 
>>  Tire Pressure Calculator.xls
>> 85KViewDownload
> 
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