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BSA_WM20, Gordon Gray, pushrod tom
Total Likes: 5
Original Post (Thread Starter)
#867978 01/03/2022 2:24 PM
by Dave Martin
Dave Martin
Hi, I am pretty sure I know the answer, but ............ is there anyway to make the gearing of 4th a bit taller? B44 1967 (ish) I have put a large sprocket (56 tooth) on the back to make the gearing lower for the off road trail type stuff I do (and it looks mean!) but it has left top gear a bit short for the few bits of "road" we have in this country. All other cogs are standard.
The bike still gets up to 60 to 70 mph but it just feels cruel to rev it that much.
Liked Replies
#868316 Jan 6th a 04:50 PM
by Mr Mike
Mr Mike
Each change of sprocket improves something at the expense of something else. If you "Want to have your cake and wat it too" you really need a fifth gear. Remember when American cars had 3 speed transmissions uggg!. If you are going to run above 55mph most of the time the 19/47 keeps the vibes down. OTOH that combo doesn't work so good between 40-50mph as it requires a lot of running in 3rd gear. So, my advice is decide what speeds you'll be riding and get it right the first time, so you don't have to pull that whole primary side off to change the drive sprocket. One tooth on the drive sprocket gets you a little over 5% change whereas a change of the rear sprocket only gets a bit over 2% change.

IMO if you are gonna run on flat roads and occasionally on a four lane use a 19/47. If you are in exclusively hilly country roads, like TSMR 18/47 or even 17/47 might be the best. 17/47 was always too low for me.
Mr Mike
3 members like this
#868407 Jan 7th a 11:30 PM
by Peter Quick
Peter Quick
Originally Posted by Dave Martin
Hmmm ......... where? and how much?

I likely have all the wide ratio gears, and ALOT is how much.

The wide ratio gears that would drop into a B44 motor are extremely thin on the ground. Earlier C15 wide ratio gears would not drop into an end fed side points motor.

1 member likes this
#868781 Jan 11th a 07:46 PM
by Mr Mike
Mr Mike
As much as you tinker, you need a lift to put these bikes on. I built one out of plywood and 2x4's and it raises up with a garage jack. It goes from a ramp to level at 24 inches. A couple of ratchet straps keep it very stable. Then get one of those scoot around stools at Harbor Freight and you'll be doing your back and knees a favor.

Mr Mike
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