Trial Tire Pressure

Borgschulze said:

I feel sorry for your ankles, and jewels.

Bmx tires at high psi make for really smooth, fluid landings.

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You just need to learn to roll out.

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Joe2005 said:

You just need to learn to roll out.

Me? I can roll out fine.

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Evan Byrne said:

Me? I can roll out fine.

Me too...?

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It was just a statement it wasen't pointed at anyone.

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Joe2005

nobody knows what happened to that boy after that.-Nutcracker

i know. he was kidnapped by aliens, learnt their ways, stole the
biggest ship he could, travelled back in time by mistake and crashed
the plane on the earth surface. he was the one who killed the
dinosaurs. -ivan
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i weigh 70kg (150lbs) and run my CC on a bit less than 24 (i let air out
after it was too hard)
mind, I'm no trials expert, just getting into trials (and a bit of
street, they're pretty similar)

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Well, im a light one - im about 55-56kg and run mine about 20-22psi

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I finally got a tire pressure guage and measured some tire pressures.
This is what I got:

KH20 with CC: 15 psi
KH24 with Duro 15 psi
KH29 with Klaw 30 psi

I filled up the KH29 so it was rock solid.

I filled up the KH24 and KH20 until they were to hard and released air
untill they felt comfortable for jumping and drops.

At 20 PSI I don't feel that I am getting much tire compression and the
landings after drops are hard on my joints. At 15 psi I can compress
the tire nicely before hops and I can do drops fine without ever
getting pinch flats.
My highest hops are park bench height probably about 40-45cm. My
hieghest drops are probably around 70-89cm. I also do side gaps of well
over a meter and never have the tire fold on me. Just for reference I
weigh about 62kg.
I can't state how important the rollout is. Every once in a wile when I
don't do a good roll out I can totally feel it in my joints.

I was surprised that both the KH24 and KH20 felt best at exaclty the
same PSI. I think that the KH29 would also ride good on higher psis. It
is very hard to turn on asphalt with lower psis with the KH29.

Unicorn

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Unicorn said:

I finally got a tire pressure guage and measured some tire pressures.
This is what I got:

KH20 with CC: 15 psi
KH24 with Duro 15 psi
KH29 with Klaw 30 psi

I filled up the KH29 so it was rock solid.

I filled up the KH24 and KH20 until they were to hard and released air
untill they felt comfortable for jumping and drops.

At 20 PSI I don't feel that I am getting much tire compression and the
landings after drops are hard on my joints. At 15 psi I can compress
the tire nicely before hops and I can do drops fine without ever
getting pinch flats.
My highest hops are park bench height probably about 40-45cm. My
hieghest drops are probably around 70-80cm. I also do side gaps of well
over a meter and never had the tire fold on me. Just for reference I
weigh about 62kg.
I can't state how important the rollout is. Every once in a wile when I
don't do a good roll out I can totally feel it in my joints.

I was surprised that both the KH24 and KH20 felt best at exaclty the
same PSI. I think that the KH29 would also ride good on higher psis. It
is very hard to turn on asphalt with lower psis with the KH29.

Unicorn

Holy mother of mine! 15PSI! At my weight i even bottom out at 15PSI!
Could the tyre realy make that much difference?
(I'm not doubting you one single bit, just took me by surprise!)
If i go much less than 20PSI my tyre tends to fold a tad too much for
my liking and it also bottoms out easy at such low pressures.

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Mill_Mobile

I measured a few times because I myself was surprised at 15 psi! First
of all, how much do you weigh? Second the type of tire matters quite a
bit. I think that the thickness of the wall maters but volume is a big
player. Which brings me to the third point. Volume is determined both
by the thickness of the tire and by the thickness of the rim. On the
fat 2.5 and 3 inch tires with a 47mm Kris Holm rim you have a LOT of
volume! Notice that withthe Kenda Klaw tire I ride at 30 psi.
My tire does compress a lot when doing drops but I don't hit hard
enough to get pinch flats.

Unicorn

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Unicorn said:

Mill_Mobile

I measured a few times because I myself was surprised at 15 psi! First
of all, how much do you weigh? Second the type of tire matters quite a
bit. I think that the thickness of the wall maters but volume is a big
player. Which brings me to the third point. Volume is determined both
by the thickness of the tire and by the thickness of the rim. On the
fat 2.5 and 3 inch tires with a 47mm Kris Holm rim you have a LOT of
volume! Notice that withthe Kenda Klaw tire I ride at 30 psi.
My tire does compress a lot when doing drops but I don't hit hard
enough to get pinch flats.

Unicorn

Im only 55-56kg, thats why i was so surprised you didnt bottom it out!
I guess that means the walls on a CC are thicker than a Luna.

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mill_mobile said:

Im only 55-56kg, thats why i was so surprised you didnt bottom it out!
I guess that means the walls on a CC are thicker than a Luna.

Wrong.

Other way around.

Creepy Crawler = Saran Wrap

Luna = Solid Concrete

Direct comparison of having both tires off the rim side by side.

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Borgschulze said:

Wrong.

Other way around.

Creepy Crawler = Saran Wrap

Luna = Solid Concrete

Direct comparison of having both tires off the rim side by side.

Well Borgschulze, you have convinced me to keep my Luna 🙂
Thanks - i was never unhappy with it, was just keen to try something
different!

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Unicorn said:

I finally got a tire pressure guage and measured some tire pressures.
This is what I got:

KH20 with CC: 15 psi
KH24 with Duro 15 psi
KH29 with Klaw 30 psi

I filled up the KH29 so it was rock solid.

I filled up the KH24 and KH20 until they were to hard and released air
untill they felt comfortable for jumping and drops.

At 20 PSI I don't feel that I am getting much tire compression and the
landings after drops are hard on my joints. At 15 psi I can compress
the tire nicely before hops and I can do drops fine without ever
getting pinch flats.
My highest hops are park bench height probably about 40-45cm. My
hieghest drops are probably around 70-80cm. I also do side gaps of well
over a meter and never had the tire fold on me. Just for reference I
weigh about 62kg.
I can't state how important the rollout is. Every once in a wile when I
don't do a good roll out I can totally feel it in my joints.

I was surprised that both the KH24 and KH20 felt best at exaclty the
same PSI. I think that the KH29 would also ride good on higher psis. It
is very hard to turn on asphalt with lower psis with the KH29.

Unicorn

lol
the guage you used is WAY off

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squashy enough to bounce and hop, hard enough not to fold. there is no
magic number - other than 42🙂 - but that is not really related to tire
pressure in any other way than both fourty-two and unicycling being the
meaning of life.

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mcnuggets300 said:

whats the point of living if you cant enjoy life?
man cops need to chill out a bit
"are those firecrackers son?"
"no, they're loud cigarettes, wanna try?"

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uni_jim said:

squashy enough to bounce and hop, hard enough not to fold. there is no
magic number - other than 42🙂 - but that is not really related to tire
pressure in any other way than both fourty-two and unicycling being the
meaning of life.

I dunno I like my tire pressure at 42 psi for trials....

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