Rear Sprocket

[hibuck1]

What is the difference between a big twin ridged rear sprocket and a hydraulic rear sprocket

[RUBONE]

Enough that none interchange. The depth the shoulder is machined, or in some models not there at all, rivet hole size, etc.
Robbie

[j**r**m]

Anybody know where to find a decent repop one for a rigid drum?

[59Panman]

I ended up purchasing a new drum with the sprocket from Paughco for my 59.

Here is the link to their website

http://www.paughco.com/2008-catalog/pdf ... wheels.pdf" onclick="window.open(this.href);return false;


B206B Mechanical brake drum with sprocket and dust cover
for 1937–1957 rigid (OEM 41400-37)_______ $224.95

[Panacea]

Anybody know where to find a decent repop one for a rigid drum?

PM me, I have a nice one...Mike

[hibuck1]

what is the difference if i am holding an NOS sprocket in my hand. it has 4 larger holes (3/16) and 16 smaller holes (9/64) whith a step down lip from the teeth to the rivet hole surface

[Panacea]

The larger rivets are for indexing the sprocket location, the counter bore is for the drum...Mike

[hibuck1]

i understand that mike, but what the original question was is this is what i have and am holding in my hand how do i tell if it is a ridged frame model or a duo glide model sprocket?

[Cotten]

Hokey smokes Folks!

The Parts Catalog lists four different sprocket kits covering the DuoGlide era.

Nothing is certain until you lay the sprocket upon the drum... and inspect the rivet kits as well.

But meanwhile!...
Liberty offers a $5 bounty upon any well-used American Big Twin drum sprocket at Davenport each year.

(Except chromed.)

Didn't get even one this year.

....Cotten

[Panacea]

hibuck, you could narrow it down by measuring the rivet holes. 41-59 used 1/8" rivets, 60-68? used 3/16"...Like Cotton said there are four different part numbers all starting with 41470-30, -58, -60, -62...Mike

[hibuck1]

Thxs Panacea so it would be safe to assume that if the small holes r 9/64 which r 64th bigger than 1/8 and large holes r 3/16 it would be a 41 thru 57 sprocket

[Panacea]

The parts book doesn't give the dowel pin size but the 1/8" rivet did run from 41-59...Mike