Yamaha TRX850 Enthusiasts Forum

has anyone tried 16/42 sprockets ?? Ive got 16/39 but first gear still seems very tall ,also now my bikes a street fighter i dont need anything over say 120mph, i would like more pull at the bottom end and midrange

Changing your sprockets will not give you any more torque but will create that effect And first gear is tall even with lowered gearing

I'd say 16 / 42 was too low and I'm sure it has been tried (Honk?) but why not give it a go. It'll only cost you £15 and if you don't like it I'll give you a fiver for the 42 rear

the 42 will be here Tuesday so i will be trying it ,,i hope i can get the hang of wheelies,, which i think its going to do,,,,,A LOT

Steve,
Where'd you order the 42 rear from, what make and how much? I want one!
Ta.
Dave

trixynut wrote:Steve,
Where'd you order the 42 rear from, what make and how much? I want one!
Ta.
Dave

Dave

I've run a 42 rear for the last 5 years

TDM900 42t from B&C express - about £22 delivererd

phuk72.. have you got a 16 front with the 42 if so how do you find it performs ? :

No - I run 17/42 which I believe is a perfect compromise

Don't want to start a debate but I personally will never fit a 16t front

well Ive just been on a test ride with the 16/42 sprockets ,its a lot smoother in first gear, the drive out of corners also seems smoother and on the motorway at 6000rpm its doing 95mph so for now i cant see any downside ,i have a 17 front but if i put that with the 42 rear i would have thought its the same as 16/39,,,any input ??

Gearing wise 17 / 42 is broadly the same as 16/39

If you are happy with 6k rpm at 95 and a top speed of 120 then I'd say keep it. It's not for me though.

I would say give the 16 front a go. I've just done a chain and sprocket set and the front that came off was 16 (39) rear. It had done 26,000 miles with no problems so i dont see a problem running the smaller front.
For ease of assembly i will prob go with the larger rear at some stage as changing the front is a bit of a pain. Took about 4 goes to get the gear lever back on in the right position

These are the speeds that you will acheive with the following ratios
@ 6000 R.P.M.

Front Sprocket/ Rear Sprocket/ Speed
16 / 39 = 173 K.P.H.
16 / 42 = 160 K.P.H.
17 / 39 = 183 K.P.H
17 / 42 = 170 K.P.H.

Enjoy

not sure if the numbers above are real world ,take the 16/42 thats 160 kph or 99.41mph,thats 16.5mph per 1000rpm now if your still with me that's 148mph@9000rpm,, it didnt do that with the std gearing ,,that's assuming it will rev to 9000 in top and with the low gearing it should !, anyway it still feels a lot better and is still capable of breaking every speed limit in the uk