Cog Question

Post by **firestorm_al** » Tue Sep 03, 2002 4:32 pm

I currently have standard size front and rear sprockets front and rear. The question is, is it ok to keep the same length chain if I go down one tooth on the front sprocket??

Al.

Post by **firestorm996** » Tue Sep 03, 2002 5:02 pm

Don't see why not, mine's been like that for the last 18k.

Post by **firestorm_al** » Wed Sep 04, 2002 12:17 pm

What are the standard sprocket sizes for the Storm again??

I did try a search on the Yahoo e-mail group but the search facility seems to be pretty cr8p lately.

Al.

Post by **firestorm996** » Wed Sep 04, 2002 1:16 pm

16 tooth front
42 tooth rear

Post by **firestorm_al** » Wed Sep 04, 2002 2:25 pm

I thought it was a 41 tooth rear?

Post by **firestorm996** » Wed Sep 04, 2002 3:22 pm

Well if a standard one is 41, that may account for why my speedo is 16% out instead of the usual 14%

I currently have a renthal 42 rear and a 15 front, I was assured the rear was standard and there was too much gunk on me old one for me to be arsed counting em. :wink

Post by **firestorm_al** » Wed Sep 04, 2002 3:30 pm

So how is your storm on the track with that gearing?

Post by **firestorm996** » Wed Sep 04, 2002 4:35 pm

Haven't had it on track since I changed the rear, but the 15t has been on pretty much from new. It pulls nicely and there aren't any gaps between gears, never had a problem with it as it is.

It's been to Cadwell, Darley (twice), Oulton Pk and the Nurburgring so far.

Post by **firestorm_al** » Wed Sep 04, 2002 4:39 pm

What I need to be able to do is the hairpin at knockhill without stalling it in 2nd or having to drop down to 1st!

Post by **firestorm996** » Wed Sep 04, 2002 5:02 pm

That's precisely the problem on standard gearing m8, there's a huge gap between 1st and 2nd. The other gears aren't as bad but the easiest fix is to whack a 15t front or a 43t rear (less severe). The rest of the gearing (3/4/5/6) doesn't suffer as you're only talking a few hundred rpm difference. Plus if you think about it there's less load on the engine too if the gearing is shorter, which is a good thing.

Post by **firestorm_al** » Mon Sep 09, 2002 1:58 pm

15 tooth sprocker arrived this morning. Hopefully get it done at the weekend.

In the meantime, I fitted a Sigma computer to the bike to give me a realistic speed measurement after I've changed the sprocket.

A usefull wee formaula to have if you've fitted one and are trying to get the callibration correct is -

new_circumference = real_mph * old_circumference / displayed_mph

A good way of doing it is to zero both the origonal trip and the Sigma trip then go for a long ride. Take a note of the recorded trips on both then insert them in the above formula instead of the mph figures.

Al.

Post by **firestorm_al** » Tue Sep 10, 2002 11:03 am

After my run last night the callibration figure with a ne MEZ3 tyre is 1144.

Just need to get the front cog fitted and take a couple of pictures of my Sigma pickup mounting just for the record.

Al.