For those who have a tacho...

Not sure about 70 but I think at 50mph I'm at 3000rpm, 60 is 4000. I only calculate that because I never always know when I'm in top and keep making dummie changes. Eric

 

Sorry forgot to mention that I'm on cast wheels as they are smaller

 

Hi, Just been out for a blast this morning, the tacho read 4500 revs at 80mph if thats any help ? My bike is an SE with 17' front wheel .................

 

I'm on spokes but mines the same - 4000rpm = 60mph - the way I know I'm in top as well.
Roughly 70mph seems to be about 4700rpm and 78mph just shy of 5000rpm.
Will be changing to a 19 tooth front sprocket soon (when I get a 36mm socket) so it will be interesting to see the difference.

 

Roads are not long enough!:tongue:

 

Finally bought a 36mm socket and fitted the 19 tooth front sprocket - not too difficult but it is quite a bit larger than the 18 tooth so you have to slacken off the chain adjustment a bit to get it on.
First run and I would say not too much difference below 50 but at 60mph its down to 3600 rpm - so a difference of around 400rpm from stock. Feels more relaxed and will help with my longer motorway runs.

 

What do you have to do to fit it , is it easy enough for someone with basic mechanical knowledge ?

 

Yeah it's not too difficult as it basically involves taking off the sprocket cover, bending back the lock washer and then undoing one big nut, sliding off the old sprocket and replacing it with the new one and then the cover - bolts 9Nm. However, you will need to slacken the chain to allow for the increase in diameter. If you've adjusted your chain tension before then you'll be OK. You will need a 36mm socket and a torque wrench - nut goes back on at 132 Nm.

 

Thanks for your help Steve, I think I could manage that ! I have a 36mm socket which I used to remove a flywheel on an old VW Camper, so I just need to buy the larger sprocket. Thanks again...........

 

No problem - I got mine from triumph parts page2 - £11.99 plus postage. Good luck!