DR650SE Rear Sprocket Help

**paulj** · 11th December 2006, 18:55

Far has helped me identify the rear sprocket hub on my 95 DR650SE as being 'non-standard', or at least not what is used on post 95 DR650's - the sprocket hole diameter is 133mm which it seems, is limiting my choice of rear sprocket sizes (I want to gear the bike down using say a 56 tooth).

Overseas (Aus) suppliers can't do more than a 41 on this hub...

Now, post 95 models of DR650 use a different part number for the rear sprocket hub - I'm hoping that by swapping out my 95 hub for a 96 or later I will be able to use a wider range of sprockets. The only catch being, will the later sprocket mate with the wheel hub? If not a new wheel, if so I'm in heaven.

Attached here is a pic of my 95 hub - with approximate dimensions of the sprocket diameter and mating face.

Anyone got a 96 hub sitting provocatively on the bench - and would be prepared to make a measurement or two?

Thanks -

**merv** · 11th December 2006, 19:35

Well what you are saying doesn't make sense. Mrs merv's DR650SE is a 2004 model and I just chucked a tape measure over the back hub, couldn't be bothered taking the wheel out or anything like that in my flash clothes, and it measures the 133mm just like you are saying for your 95 and I take it from what you are saying you thought the post 95 would be different. Well what I'm saying is yours is the same as ours so it isn't different.

**paulj** · 11th December 2006, 19:56

Great - thanks Merv - from what the Aussie supplier told me, 96 onward bikes have a different sprocket hub allowing up to 56 tooth sprockets - the 47 I got down had (from memory) about 145mm sprocket diameter and therefore did not fit my hub ... hmmm - they're cunning these Japanese!

Again - thanks for your help ...

**merv** · 11th December 2006, 20:08

If you go to this page http://www.kiwibiker.co.nz/forums/sh...=10556&page=15 you'll see Bartman10 posted a link to a DR650SE service manual. If you download that 80+ megs, you'll see some detail but the hub shown for post 96 is exactly what we have and it looks like yours. No dimensions given. Only difference mentioned is Canada/USA spec bikes ran 15/42 sprocket combo while others, like ours, are 15/41. So 42 should be available but that is such a small difference I don't know why they bothered. If you really could get a 56 sprocket that would be a huge muthafucker.

When we bought ours Whitetrash told us larger back sprockets were hard to come by, but he had a 14 front sprocket put on and we've run it with that gearing ever since, and its OK on the road and gravel roads but is too high geared for trail riding so we don't use that bike for harder-out stuff.

You've already been on this thread http://www.kiwibiker.co.nz/forums/sh...ad.php?t=39185 where far q mentioned the sprockets he uses 520 instead of 525. As low as he goes it seems is 13/44 which is a ratio of 1:3.385 compared to stock of 15/41 which is 1:2.733. Now that is a change of 1.238 times which means almost 25% more lower geared. How much do you really need?

I've attached a couple of Word docs showing gear ratios 14/41 like we run and the 13/44 like far can use as a comparo. I've copied these off Excel because I can't attach .xls it seems. Does that give you an idea of the differences.

**merv** · 11th December 2006, 20:35

OK so you'll see I've now added more stuff to my post above.

**cooneyr** · 11th December 2006, 21:08

Given that it is now dark in the garage and I dont have lights I havent check measurements but I'm with merv - the sprocket hubs look exactly the same.

I've not geared down at all - still using 15/41. Found it too high for waimak river trails at a comfortable speed in but just have to keep the speed up. Have a 14 front (came with bike) but dont like it on adventure rides as feels like torque is used better with 15 tooth. I think I'll go down the 13 tooth front path (as per FQ) for the tighter trails but leave the rear sprocket alone.

Cheers
R

**paulj** · 12th December 2006, 04:20

Thanks folks- I don't necessarily want a 56, it's just the opportunity to go there. I have done the 13 front a la Far which is a small but useful change. The 44 rear it seems is not available (well that's what the Aus man said - not for the 95 bike, yes for 96 onwards).

The part number being changed at that time suggested to me a modified hub, perhaps allowing the larger diameter sprockets - seems this is wrong. I have the service manual and Far's link does show the hub part numbers http://www.ronayers.com/fiche/getyea...u&groupid=1170.

I saw a 56 on ADVRIDER - yes it was a monster - I'll go back there and trawl around until I find it and ask the question.

on on ...

**far queue** · 12th December 2006, 09:04

I'll find out where you can get one of my back sprockets if you like. I just rang DAS but they can't remember where they got it for me. I'll check it out at home tonight for brand names etc, and then get a supplier from DAS for you.

**warewolf** · 12th December 2006, 10:18

I could be wrong, but aren't sprockets measured across the bolt hole centres? That could explain why you seem to be having trouble finding something? You're quoting a dimension number that is too small? (It could also be that the 525 size is much less common than 520 or 530.)

Regardless, try speaking to Chris Haggerty from Chain Gang. Very knowledgable and helpful chap.

**far queue** · 12th December 2006, 17:58

OK sunshine, here you go ...
This is the standard sprocket you have on now.
This is what I have on and what you're looking for.

They're available from 41 to 52 tooth, but you wouldn't want to go above 44 unless you're going to remove the nylon chain guide under the swingarm or replace it with a different one. So, there you go, go and order one from the same place you got the front sprocket from, and you're all set. Merry xmas, ho ho ho.

**NordieBoy** · 12th December 2006, 20:52

Originally Posted by far queue

OK sunshine, here you go ...
This is the standard sprocket you have on now.

A 525 on a 1995 DR650?
I thought they were 520 'till '96?

Ahh.
That may be the "non standard" bit.

**far queue** · 12th December 2006, 21:14

Originally Posted by NordieBoy

A 525 on a 1995 DR650?
I thought they were 520 'till '96?

Ahh.
That may be the "non standard" bit.

Pre '96 is indeed 520 and post '96 525. The link is to the '96-'04 models. There was some conjecture as to whether he had a '96 DR650 or a '95 DR650 1st registered in '96. But, based on the pics and measurements supplied, it's a '96 or later model that he's got.

**paulj** · 13th December 2006, 05:22

Originally Posted by far queue

OK sunshine, here you go ...
This is the standard sprocket you have on now.
This is what I have on and what you're looking for.

Brilliant - and thank you all for your help and advice - the bike shop owe me so I should land this here FOC and hopefully before Santa and the Elves visit. It seems all bike shops are not created equal! I should'a hung in here first.

Next year I'll have a crack at the 56 and swing arm guides and covers.

**paulj** · 19th December 2006, 21:41

Originally Posted by far queue

OK sunshine, here you go ...
This is the standard sprocket you have on now.
This is what I have on and what you're looking for.

They're available from 41 to 52 tooth, but you wouldn't want to go above 44 unless you're going to remove the nylon chain guide under the swingarm or replace it with a different one. So, there you go, go and order one from the same place you got the front sprocket from, and you're all set. Merry xmas, ho ho ho.

All done and running sweetly - thanks Far, you're a bloody genius!