Building SS Hard Tail - need advice

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Building SS Hard Tail - need advice
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Posted: Oct 22, 2019 at 8:23 Quote
Hey all -

Building a single speed hard tail (thinking santa cruz chameleon) for some training rides and to hone in on some skills. Also, my Kona Process 134 feels like too much bike for my local trails *at times.* Any advice on the following would be greatly appreciated and welcomed. For reference, I live in NYC and ride Cunningham, Glacier Ridge, etc.

1) 29r+ or 27.5+?
2) Gear Ratio?
3) How does gear ratio interact with wheel size?

Thanks

Posted: Oct 22, 2019 at 9:17 Quote
just get a dirt jumper if ur gonna go single speed, they are so much fun

Posted: Oct 22, 2019 at 9:46 Quote
Brsmnky804 wrote:
3) How does gear ratio interact with wheel size?

Larger tire travels further with one revolution of the crank, else being equal.
25/9 is great on a 20" BMX. 25/9 would be impossible to pedal up a hill on a 29r+.

28/16 on a 28.9" tall tire (90.79" circumference) gets you a rollout of 50.58. as the tire gets taller, rollout increases.

On a bmx track, 55" is the sweet spot to get out of the gate, yet still be able to pedal out of corners. 50" rollout and you're "spun out" in the first 30 feet. But if you need to climb a hill, 45-48" rollout is what you want. Dirt jumpers go more for a 60" rollout.

Posted: Oct 22, 2019 at 10:07 Quote
fruitsd79 wrote:
Brsmnky804 wrote:
3) How does gear ratio interact with wheel size?

Larger tire travels further with one revolution of the crank, else being equal.
25/9 is great on a 20" BMX. 25/9 would be impossible to pedal up a hill on a 29r+.

28/16 on a 28.9" tall tire (90.79" circumference) gets you a rollout of 50.58. as the tire gets taller, rollout increases.

On a bmx track, 55" is the sweet spot to get out of the gate, yet still be able to pedal out of corners. 50" rollout and you're "spun out" in the first 30 feet. But if you need to climb a hill, 45-48" rollout is what you want. Dirt jumpers go more for a 60" rollout.

Very helpful, thank you

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