Gearing? trials/dirtjumping

[Yuppie]

Im wondering what gearing I should use for trials and dirt jumping. for DJing I was thinking 38-16, but I have no idea about the right ratio for trials. I want to keep the front chainring on when I change the bike over from one to the other (fork, gearing etc.) so what should my rear sprocket be for trials?

also, will a DX bmx sprocket work on an 8 or 9 speed hub with spacers?

by the way my bike is an On One Gimp fully rigis singlespeed with horizontal dropouts and some crazy geometry.....

thanks for the help.

[Banga]

from memory arn't DX sprockets for use with screw on hubs only?
being a free wheel and all.you can use any shimano sproket on a 8 speed hub if you want to use it for SS, but for spacing I just saw a twenty four seven ad in DIRT mag and they had some real good looking spacers, only one for each side of the sprocket.worth checking out.Or just get a DMR SS hub and then you can run a DX freewheel.

[Yankee Tim]

You will be running two totally different gearing setups for Jumping and Trials.

Jumping will be more of a DS setup like before mentioned.

Trials, you'll want a small ring up front like a 22. If you are only going to use one in the rear, go for something around a 19. But, you can do just fine with a standard cassette for the rear. Also, if you are doing any kind of trials, you'll want a bash ring up front too.

Hope this helps.

[Yuppie]

Originally posted by Yankee Tim
You will be running two totally different gearing setups for Jumping and Trials.

Jumping will be more of a DS setup like before mentioned.

Trials, you'll want a small ring up front like a 22. If you are only going to use one in the rear, go for something around a 19. But, you can do just fine with a standard cassette for the rear. Also, if you are doing any kind of trials, you'll want a bash ring up front too.

Hope this helps.


Ill have a bash ring anyway, but is there any way to achieve the same gearing as 22-19 with a 38t front chainring? how small do sprockets get? see Im not particulairly versed in this type of thing....

[Banga]

the closest you could get with a 38 t on the front is to run a 34t at the back and thats not really a viable option due to strength etc