Raptor Forum banner
1 - 9 of 9 Posts

·
Registered
Joined
·
46 Posts
Discussion Starter · #1 ·
If I put a 42 tooth sprocket on the rear, what size sprocket should I put on the front and would I feel a difference if I change the sprockets?
I do alot of trail riding.

ThNks
 

·
Registered
Joined
·
197 Posts
Going to a 42 on the rear you should see a large difference in torque. If you want even more you could go to a 12 on the front. If you want more speed go with a 14 or 15. But for trails a 13 or 12/42 is good. However if your front sprocket is worn I would go ahead and buy a 12 for the front.
 

·
I am unique
Joined
·
22,621 Posts
If I put a 42 tooth sprocket on the rear, what size sprocket should I put on the front and would I feel a difference if I change the sprockets?
I do alot of trail riding.

ThNks
Going up two on the back isnt quite same as going to a 12 on the front from a stock 13................
I used a 12 - 48 for oval tracking and just loved it............but that was me...........:)
 

·
Registered
Joined
·
197 Posts
Going up two on the back isnt quite same as going to a 12 on the front from a stock 13................
I used a 12 - 48 for oval tracking and just loved it............but that was me...........:)
What do you think your top speed was with a 12/48? Im thinking of going to that ratio for trails. And would like to pull wheelies in 3rd and 4th gear.
 

·
I am unique
Joined
·
22,621 Posts
What do you think your top speed was with a 12/48? Im thinking of going to that ratio for trails. And would like to pull wheelies in 3rd and 4th gear.
My setup with the 12 - 48 in oval was complimented with a wild engine that could rev 9300 rpm, top speed was about 80 mph, the engine had a 3 plughead, HV porting, 686cc, 39mm FCRs, Curtis exhaust, Reprogrammed Dyna FS CDI, and to attain the top speed the top speed limiter was bypassed............:D
 

·
Master of the Electron
Joined
·
15,622 Posts
It's simple math - with stock tires and sprockets, top speed is limited by the speed limiter to about 75mph.

SO when changing output ratios, the speed limiter will do approximately the following:

going from 13 to 12 = 12/13ths of the original top speed (12/13 = 92%) --> 69 mph

going 40 to 48 = 40/48ths of original speed (40/48 = 83%) --> 62 mph

Combining = 83% of 92% = 76% --> 57 mph
 

·
I am unique
Joined
·
22,621 Posts
It's simple math - with stock tires and sprockets, top speed is limited by the speed limiter to about 75mph.

SO when changing output ratios, the speed limiter will do approximately the following:

going from 13 to 12 = 12/13ths of the original top speed (12/13 = 92%) --> 69 mph

going 40 to 48 = 40/48ths of original speed (40/48 = 83%) --> 62 mph

Combining = 83% of 92% = 76% --> 57 mph
You get so technical..............:D
 

·
Master of the Electron
Joined
·
15,622 Posts
That's meeee.
 
1 - 9 of 9 Posts
Top