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yep, got about 1/4 inch at front with doo 9 tooth drivers hope that is enough clearance

the bigger track will cause you to lose power,thats why i geared down ,or you could get 8 tooth drivers to gear down for you. you can get these from cycle works in edmonton becsause doo does not make a 252 pitch 8 tooth,

can t see why not but i would spend the extra money and get the doo drivers no ratcheting/

put on doo extroverts very good quality same shaft dia as yamaha ,ran last year on apex rtx no problems

just put on a 2 inch 136 camoplast on attak today ,removed tunnel protectors ,put on doo 9 tooth extroverts no clearance issues yet ran on stand. also geared down to 22 top with 68 chain. should hook hard and ready for turbo or supercharger in future.

just installed 2 inch today , have about 1/4 inch at front and no rubbing any where when ran on stand.

this would give me a more mountain like gearing, stronger out of the hole. ratio should be 1.84 instead of 1.73

just wondering if i put a set of 8 tooth drivers on would it give me clearance for the 2 inch

turk,have you put a 1.75 on , i can cut down the track.

just picked up 2 inch 136 camoplast challenger and 9 tooth external doo drivers, and changing gear down to a 22 top on 07 attak ,any one else put a 2 inch on , is there enough room with tunnel protectors removed. looks like lots of room at front of track not sure above clearance will allow with...

I put a 22 0n my last year rtx gave excellent bottom end , good for jumps ,did not slow it down by alot.