Good point Thumper33. However, he wanted to increase his low end torque. You will not do this by increasing the tire size. The way to do this is to decrease the gear ratio on the rear sprockets. To keep the front ratio in line with the new rear gear ratio he has to decrease the front tire size. If you reduce the front tires by 10% (23 inch to 21 inch), you can decrease the rear ratio by 10%.
BryceGTX

 

That I understand, and I suppose I didn't address that aspect. Thanks for clearing it up though.

 

Hey XtremeSkier. Another thing you might consider is that there is a difference of about 16% between the front and rear axle speeds so that the over-running clutches in the front hubs will do their job. So you could theoretically lower the rear axle ratio by up to 16% before the front and rear would lock. It would however, take some testing to determine how low you could go before you had problems.
Just a thought
BryceGTX

 

Call me dumb call me what you want, but I have an 04 Scrambler and I swapped out the front sprocket from a 13 tooth to a 12 tooth and my front end comes up a little easier, I like the low end it gave me. Mud wasn't a problem this past weekend and it seems great to me. I didn't even notice any kind of different engagement or any problems as of yet.
I did this in anticipation of adding bigger tires next week, going to 26x9x12 front and 25x12.5x12 rear, I may even add a clutch kit if I need after the tires come in.

 

Hey mikehops43. That change resulted in approximately 10% gear ratio change. 36/13=2.76, 36/12=3.0 That does not yet exceed the 16-17% difference between front and back, so it seems you should not have a problem. If you went to a 11 in the front: 36/11=3.27, you might find that the front never comes unlocked because the change would be about (3.27-2.76)/2.76x100=18%.
BryceGTX

 

Excellent!
Thats what I want to hear
Thanks BryceGTX.
Do you have any rcomendations for a better low end clutch kit of sorts for the tires Im adding? Don't want to lose all top end but afraid with my bigger tires I might need more low end to compensate for the bigger tires. Scrammy has no low gear tranny as im sure you know.
Thanks buddy.

 

BryceGTX,

I appreciate the added knowledge here. I was working on the premise that someone told me that there was only a 5% difference between the two. I'm not doubting you, but where did you find out that it was 16%?

That's great to know.

 

LOL mikehops43. Sorry I can't help you with clutches, I'm no expert there. But there are plenty others that can help you.
BryceGTX

 

Hello Thumper33. It appears that the ratio for a scrambler has about a 16% difference. As best as I can determine:
front end = 29/14 front axle * 25/13 gear case 90 deg * 22/26 main shaft transfer * 22/23 wheel size = 3.22
Rear end = 36/13 chain sprockets = 2.77
3.22/2.77 = 1.16 or 16% difference
I hope this helps.
BryceGTX

This above information comes from the thread This Thread

 

That's all I wanted to know [img]i/expressions/face-icon-small-smile.gif[/img]... it actually came from someone looking up the gearing.

I appreciate it[img]i/expressions/face-icon-small-smile.gif[/img]