gearing

steve speed · Post by **steve speed** » Mon Oct 29, 2007 3:58 pm

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

Post by **phuk72** » Mon Oct 29, 2007 8:19 pm

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 Ãƒâ€šÃ‚Â£15 and if you don't like it I'll give you a fiver for the 42 rear

steve speed · Post by **steve speed** » Mon Oct 29, 2007 8:26 pm

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

trixynut · Post by **trixynut** » Mon Oct 29, 2007 11:25 pm

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

Post by **phuk72** » Tue Oct 30, 2007 8:48 am

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 Ãƒâ€šÃ‚Â£22 delivererd

steve speed · Post by **steve speed** » Tue Oct 30, 2007 10:19 am

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

Post by **phuk72** » Tue Oct 30, 2007 10:39 am

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

steve speed · Post by **steve speed** » Tue Oct 30, 2007 2:45 pm

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 ??

Post by **phuk72** » Tue Oct 30, 2007 2:52 pm

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.

Silver · Post by **Silver** » Tue Oct 30, 2007 2:55 pm

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

ekoja · Post by **ekoja** » Tue Oct 30, 2007 9:12 pm

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

steve speed · Post by **steve speed** » Wed Oct 31, 2007 11:51 am

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