Can anyone help

Standard gearing for the 4rt is 10 tooth front 41 rear

I use 10 / 42

If i used a 9 tooth front will this reduce the size of the rear sprocket

and what size rear would be standard

cheers

Edited August 19, 200917 yr by rapid roy

9 - 38 is approximately the same as 10 - 42

9 - 40 is slightly lower geared than 10 - 44

9 - 38 is approximately the same as 10 - 42

9 - 40 is slightly lower geared than 10 - 44

would i be correct in saying there is less chain, smaller sprocket.

Are there any disadvantages

would i be correct in saying there is less chain, smaller sprocket.

Are there any disadvantages

The 9T, 520 chain, countershaft sprocket tends to be hard on the chain (tooth/bushing engagement is fairly brutal at that small diameter) and you would more than likely experience accelerated chain wear. Most of my buddies with 4RT's have opted for a 10/44 combination and tell me that some of them have even used rear sprockets from the smaller displacement GG Pro's (44T is standard on some the smaller displacement Pros and reportedly also fit the Montesa hub) when their dealers ran out of them. They say the 10/44 combo tightens up the gear ratios nicely, allows less clutch work in slow section areas and they can use a higher gear for climbs.

Jon

I'm running 9 - 41 on my 250 Gasser. I've found using an R1 chain that I really need to have a half link in it, problem is you can't buy one for an R1. I'd like to know if there's a comparable chain + half link available. Running this set up I've found both 2nd & 3rd more useable & that I can pull 5th across the moors.