Has anyone tried this on an 2001 f4i? What were the results? I weigh 235lbs and it takes some clutch to get rolling, so alittle more out of the hole would be great! Not really woried about top end, mostly ridding in the city. Also I know the speedo will be off, but how much at 55mph?
Thanks, Mark

 

You should always change the chain and sprockets as a set. Stick with the stock size chain (525), the gear change will help with the low end torque. I'm a fat *** too (225) and I put a 16/50 kit on and like it but I'm thinkin of gettin a 15 tooth up front, As for the speedo, yeah it'll be off, there is a post somewhere on here with a formula how to calculate the difference and constantly do math equations while riding or splurge for a speedo healer for 120 bucks. I don't worry about it too much, I just go with the flow. (of traffic)

 

A friend told me today that 1 on the front is like 7 on the rear. Is this true? Also my chain and sprockets now dont have 200 miles on them, the chain is a 525 and new. But if this 1/7 theory is true maybe 15 on the front would be good enough. It sounds like quite the drop!
Mark

 

I think the 'friend' is right about the front making a bigger difference than the rear... I doubt that it is a 1:7 ratio.... I would think more like a 1:3 ratio (1 up in the front is like 3 in the back)

maybe search for that formula mentioned above... it would probably tell you exactly.

 

+1

I also think -1 up front is the same as +3 in the back

 

I believe -1 is also like +3 in the back. Ive always been told to replace the sprockets and chain together but since you say there is not even 200 miles on either of them, that would be "new" enough for me to just replace the sprockets if I wanted a gear change.

I personally went -1 in the front and +2 in the back and it gave me quite a bit more low end, so far its my favorite mod ive done and I also just go with the flow of traffic when riding and just from that it has given me an idea of how off my speedo is so that when riding with noone else around I can still pretty much do the speed limit

 

-1, +2 is the same as +5 in the back, just go with that, you know youll want to later...