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Old 07-20-2008, 09:19 PM   #1
Tim McKittrick OP
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XR650R gearing for dual sport use

I've been trolling through the mounds of dual-sport threads about the XR650R and I haven't found any specific note to final drive gearing. I just acquired a plated 2000 and I find it's seriously under-geared for street use- presently it's equipped with a 14/47 combo. It looks like a 15 tooth countershaft will barely fit with the case saver that's installed, and I suspect there are a lot of smaller drive sprockets out there too. Since I need a new chain and sprockets soon anyway, what do you guys out there run on your dual sported 650R's?
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Old 07-20-2008, 09:34 PM   #2
Justin
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15 and that 47 will do ya good for cruising 65 mph for looong jaunts.
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Old 07-20-2008, 09:37 PM   #3
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Quote:
Originally Posted by Justin
15 and that 47 will do ya good for cruising 65 mph for looong jaunts.
+1

going much taller will make it a pain in the singletrack

edit: I hit 100 across a dry lake bed with 15/47
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brad21 screwed with this post 07-20-2008 at 10:16 PM
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Old 07-20-2008, 09:39 PM   #4
RdrMtn
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How fast are you riding most of the time? 14/48 is stock. If you need to be going 65mph or faster alot of the time just get a 15 tooth front now and try it before you get a new chain and rear sprocket. 13/14/15 tooth fronts will all work with the stock 48tooth rear, stock 110 link chain length, and stock case saver (I'm sure your 47 rear would work with all three combos as well) The 15 tooth should satisfy you for top end speed unless you really want to lug it in 5th. I run 13/48 on mine but the fastest road I'm ever on has a 55mph speed limit. If I ever go on a longer road trip it's super easy to swap to a larger front without worrying about chain length.
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Old 07-20-2008, 09:54 PM   #5
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--Edit...RdrMtn you beat me to the punch...but good ideas! are we related?--

I'd so go with a 15 T front and what ever size in the rear will let you keep the 110 link chain! I have 15/45 and I love it but I had to go 108 Link. its OK if I want to swap the front smaller...but I can't put my 48 on the rear.

15/47 sounds good to me. but find something where you can throw on a 14 or even a 13 if you needed depending on the terrain. Mine fit 15/48 but the chain wasn't new (14/48 is stock at 110 link) but if it works...you can go 13/48 - 15/48 with the same chain with only a front sprocket change...

and the chain guard has to be for a 15T. XRsONLY has one...I like mine and it uses a engine mounting bolt as well instead of just the little 8mm case bolts. (may not make a difference but makes me feel better)
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Old 07-20-2008, 10:19 PM   #6
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15/47

I think the stock case saver will work. If not you can grind it slightly.
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Old 07-20-2008, 11:38 PM   #7
Tim McKittrick OP
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Thanks for all the replies!
My chain is shedding O-rings and has a few stiff links- the previous owner was not kind to it. The final drive sprocket looks OK so I'll probably start with a 15 tooth counter and a new chain.
My last "real" dual sport was a highly modded XR600R that would run an honest 100+, and was not over extended feeling at 75 or a little better. I've been spoiled by my 950 Adventure and seem to think all bikes should be able to rocket up to the ton - and while the 650R will do killer wheelies below 60 or so, it's feeling a little wrung-out over 80.

Not that I would ever go that fast. No, never. Not me.
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Old 07-20-2008, 11:51 PM   #8
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I run a 15/48 with an xr's only case saver. The stock case saver is too tight for that particular counter sprocket.
xr's is a nice unit that mounts to the engine mounting bolt and has enough room for a 15.
I carry a 14 tooth cs when I know it's gonna be steep.
I've gotten pretty savy at the swap, down to 12 minutes. The 15/48 is nice for the road, and I've actually gotten so used to it that I've been leaving my 14 at home. Momentum is everything.
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Old 07-21-2008, 06:05 AM   #9
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I run 15/46 with 17" rims and slicks. Just yesterday did a day of

single track/dirt/gravel and the last leg of the ride was ~10 miles

of interstate.
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Old 07-21-2008, 10:42 AM   #10
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I've used 13/37 on my XR650R.. the engine vibration is mainly what I couldn't stand at highway speed.

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Old 07-21-2008, 11:02 AM   #11
Twotrak
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Gear Ratios:

With stock gearing (14/48) and stock tire I get 12.15 mph/1000 rpm in top gear. So 65 mph is about 5350 rpm. I ran the other numbers and if I didn't screw up the math it should be about as follows: 15/48 is 12.98 mph/1000rpm and 5000 rpm at 65mph; 15/47 is 13.3 mph/1000 rpm and at 65 you're at 4887 rpm; 15/45 is 13.89 mph/1000rpm and at 65 you're at 4680 rpm. 14/47 is 12.41mph/1000rpm and at 65 you're at 5238 rpm. I saw in the manual that the Australian model comes with a 15/41 setup which would be 15.25mph/1000rpm or 4262rpm at 65mph. The engine can pull tall gears but the transmission ratios aren't wide so your limitation is going to be how usable is the first gear ratio for the riding you do. (My numbers above are all based on a tire that rolls 81 inches per turn with my weight on it. Changing tire/wheel size changes everything.)
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Old 07-21-2008, 02:24 PM   #12
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Quote:
Originally Posted by Twotrak
With stock gearing (14/48) and stock tire I get 12.15 mph/1000 rpm in top gear. So 65 mph is about 5350 rpm. I ran the other numbers and if I didn't screw up the math it should be about as follows: 15/48 is 12.98 mph/1000rpm and 5000 rpm at 65mph; 15/47 is 13.3 mph/1000 rpm and at 65 you're at 4887 rpm; 15/45 is 13.89 mph/1000rpm and at 65 you're at 4680 rpm. 14/47 is 12.41mph/1000rpm and at 65 you're at 5238 rpm. I saw in the manual that the Australian model comes with a 15/41 setup which would be 15.25mph/1000rpm or 4262rpm at 65mph. The engine can pull tall gears but the transmission ratios aren't wide so your limitation is going to be how usable is the first gear ratio for the riding you do. (My numbers above are all based on a tire that rolls 81 inches per turn with my weight on it. Changing tire/wheel size changes everything.)
Oh that's good shit right there.
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Old 07-21-2008, 10:35 PM   #13
Tim McKittrick OP
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Thanks for the math, Twotrak. I ordered a 15 tooth counter today and will keep the 47 at the rear for now- I have to admit I found the space between 4th and 5th to be a little short, so I get what you mean about the limiting factor being where 1st gear ends up. Has there ever been a wider ratio gear set available? A taller 4th and 5th would really help.
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