Rear sprocket interchange.

Shearboy

Well travelled
Location
USA CO
So I have done the big etc etc and previously was running a 40-tooth rear sprocket.
Putting the bike back together I stayed with 40 tooth and holy shit does it pull like a SOB. However, the chain was knackered so ordered a new front sprocket and also put the OEM rear sprocket on to see how it would go with the mods done. I don't like it! Lost a fair bit of the fun pull-up hills it had before so I'm looking for a 39 tooth sprocket, I know no one makes one for the Himalayan but surely there is another brand sprocket that might fit, it's just a 520 sprocket after all It's just the mounting holes I have to find in the right spot. Anyone got any ideas or maybe have another maker's sprocket in the garage they could compare, I have Shecos but are way too big of a radius for the mounting holes.
 

Eatmore Mudd

Moderator
Staff member
Enfield isn't known for "reinventing the wheel" the use off the shelf component suppliers just like everyone else.
My gut hunch is the sprockets fit more than one application, we just have to figure out which ones.
 

Laserman

Well travelled
Staff member
A 39? That would likely have to be custom. I have a stock 38T steel sprocket with minimal wear if you're interested.

I don't need it because I'm running an aluminum 36T. I'll update this post tomorrow with a picture, the 38T is at my work.

Edit: at the very least, it'll be a good reference. I'll also measure the BCD.
 

RotorWrench

Well travelled
Location
USA
A number of years ago I had a couple of sprockets custom made. There's quite a few shops doing that now and the price was very competitive. If I remember correctly, the rear sprocket was only around $10 or $15 more than an OEM sprocket. Worth it for me for what I was doing at the time.

If you don't have any luck and got to have it, definitely worth checking out.
 

Shearboy

Well travelled
Location
USA CO
A number of years ago I had a couple of sprockets custom made. There's quite a few shops doing that now and the price was very competitive. If I remember correctly, the rear sprocket was only around $10 or $15 more than an OEM sprocket. Worth it for me for what I was doing at the time.

If you don't have any luck and got to have it, definitely worth checking out.
Yep, I'm looking at that route too. Sprocket Specialists seem like it would be no problem for them. Looking around the interweb I can see plenty of 39s but haven't found one worth trying yet as far as fitment.
 

Shearboy

Well travelled
Location
USA CO
A 39? That would likely have to be custom. I have a stock 38T steel sprocket with minimal wear if you're interested.

I don't need it because I'm running an aluminum 36T. I'll update this post tomorrow with a picture, the 38T is at my work.

Edit: at the very least, it'll be a good reference. I'll also measure the BCD.
I have no need for the 38 thanks Mate but getting accurate BCD and hub fitment would be bloody excellent, cheers
 

Laserman

Well travelled
Staff member
Okay, so my low measurement is 88.1MM for BCD/PCD and my high measurement is 88.9MM. 88.9MM happens to be 3.5" BCD/PCD.

There is no offset to the stock sprocket, it is flat. The holes measured 10.2MM or ~0.4"

I just got home from work and so haven't researched it yet, but I bet it won't be hard to find a sprocket using this info. Hope it helps!
 

Roy Gavin

Well travelled
I think the stock sprocket is 525.
I bought a 40t from a Ebay vendor and it had 9mm holes. So apart from the hole size there are other sprockets that fit
They were easily drilled out , so might extend the search a little
 

Shearboy

Well travelled
Location
USA CO
How big is the central hole, hub hole? Thanks for pitching in guys. If poking around the internet doesn't turn something up then this info would be good to send to a sprocket maker .
 

Laserman

Well travelled
Staff member
Center bore is 61.2MM, or about 2.41". Sorry I omitted that info from my previous post, I meant to include it!

Been super-busy at work after a recent promotion, haven't had time in the garage to post from my PC, heh
 

Bluestrom13

Well travelled
Location
Oocairs
Did I not propose this a year or so ago? Did I get any takers? Nope!
You havin' some deja Vu ?

But using the 'search' function did not find it for me. A trawl through OG's old posts was required.
And if I didn't know it was there to find, don't suppose I'da gone lookin'.
 

OldGuy

Well travelled
Location
Seattle,WA
Bluestrom13, Fair enough. Old threads do get lost over time. At the time, there had been some discussions about lowering the gear ratio, and I felt a 40 tooth would be better. I ended up buying one, although I haven't taken the time to install it. Probably over the winter.

I'm sure the price for one now would be nearly the same if you want the contact info.
OG
 

Shearboy

Well travelled
Location
USA CO
Bluestrom13, Fair enough. Old threads do get lost over time. At the time, there had been some discussions about lowering the gear ratio, and I felt a 40 tooth would be better. I ended up buying one, although I haven't taken the time to install it. Probably over the winter.

I'm sure the price for one now would be nearly the same if you want the contact info.
OG
I have had a 40 tooth on for a long time and only changed back to the 38 after I did the big bore etc , I really feel a 39 would be best for what I ride with this setup but undoubtedly the 40 was excellent before the big bore . Yes I would love your contact to a sprocket maker.
 
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