The Street > The Bike Shop

lets talk tire sizes, pressures etc

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Sasper:
hi guyz, I havent been posting lately, and as dead as this place is, I still like to check in from time to time.
so, If any of the older members remember me besides my vote for my sister thread haha, I have always been saying that big tires ( 2.1 and bigger ) suck and are stupid etc.
when I first got my KHE 1.9 MAC 1.5 street tires ( its about 1.9" wide ) I fell in love, light , good grip and I like the shape cause I do alot of hang 5 etc, feels round , so shifting to manual 180s feels natural ( not like my ODSY paths did which always felt like (_) kind of. )

ok so, this summer I was talking to this local pro , he rides some 2.3 tires from demolition I think. I asked what pressure he has in there and why.
he said 4.3 bars ( mine are at 6 in the summer, and 5.something in the spring since my wrists are not used to hard shocks. )
and the reason he said, lower pressure helps him hop higher.
 can there be any truth to that?
as in , you press down hard before the bunnyhop and you load the tires with pressure and when you finally start going up .02 seconds later this flex and pressure will give you more pop ?

what do you guys think?

Narcoleptic Insomniac:
Might be all a mental thing but I feel like higher pressure in the back needs slightly more force to pull up. On the other hand it's faster and more responsive.

Prodigal Son:
I can't imagine running large low pressure tires. I like riding bowls.

As a mathematics exercise:

(6bars) 14.5 psi/1bar 87psi
(4.3) 14.5 psi/1bar 62.3psi

G:
I like big tyres. You have to hit them harder to pinch puncture (for a given pressure) and they are more forgiving on hard landings (for a given pressure) but have very similar rolling resistance (for a given pressure).
Personally I run the same pressure (so I get these gains in trade off for a bit of weight) but if you want to run lower pressures then you are more likely to "get away with it" on wide tyres than on narrow ones... It's all personal preference, live and let live etc...

:)
G.

Sasper:
but what about answering my question, which is that , is there any truth behind bigger tire  - less psi - better bunnyhop?
i dont think so but..

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