Challenger sprocket/tyre questions

[Marley Peter]

Hi,
could anyone advise on challenger sprocket sizes at the moment i have Wheel 60, engine 21, gearbox 17 is this ok for motocross .
Also advice on tyre selection for front 4.00.19, rear 4.00.18 would like biggest section to fit banannas
Gone me Pete

[stormer254]

With a 19 " front sounds like an American import, for a good front tyre you would be better of with a 21" rim Gearing sounds about right without looking in a manual.

[Chris Robinson]

Hi Pete.
I ride a Mk2 Challenger and the sprockets are as follows.
Engine sprocket 25, Clutch sprocket 54, Gearbox sprocket 15, Rear sprocket 70. Of course sprocket sizes are a matter of personal preference and ability. For me the ones I use are plenty fast enough and with my ability I am more concerned with getting up the steep hills that abound down here in the West country scramble courses, particularly if it is wet
Chris.

[dave higgins]

Hi chris, happy new year to you, i think the gearing on your challenger must be spot on, i was following you around temple cloud circuit & you were as quick on the flat as you were on the hills, so if marley follows your advise, he should not be dissapointed.
Hope to see you at a meeting soon, dave.

[Marley Peter]

Challenger sprockets ect

Hi all,
thanks for that i am still finding difficulty in getting tyres 4.00.18 are not made in S12 motocross neither do they do 4.00.19 in fact it would appear no one does any help would be good
Gone me Pete

[John-Boy]

You need to look at metric sizes, I believe 100/100x18 is nearest to 4.00x18.