Help finding off set sprocket for a 200 rear hardtail

nashville Chris · Oct 19, 2015

Hey guys been wanting to hard tail a xs650. I have a Harley 16.5 rim and 200mm tire off an old bike. I was wondering if anyone sells off set sprockets for front and back. I really don't like the jack shaft idea to much. Thanks I am new here just looking for help.

fredintoon · Oct 19, 2015

nashville Chris said:
Hey guys been wanting to hard tail a xs650. I have a Harley 16.5 rim and 200mm tire off an old bike. I was wondering if anyone sells off set sprockets for front and back. I really don't like the jack shaft idea to much. Thanks I am new here just looking for help.

Hi Chris and welcome,
hopefully somebody knows someone and will post about that.
Thing is, you can run the stock front sprocket if you are prepared to run the 200mm tire offset from the front wheel.
Note that some BMWs are built that way from the factory.
If running your hardtail dog-tracked don't appeal to you, OK.
Once you offset the front sprocket you are free from the 18T maximum tooth count so long as you can make a narrow enough forward control onto the shifter shaft.
You can turn the teeth off a stock sprocket, weld a spacer tube over it big enough to fit a 36mm socket down and bore out a (say) 22T sprocket to weld onto the spacer tube's outer end.
Put a (say) 44T sprocket on the Harley wheel and she's done.

TwoManyXS1Bs · Oct 19, 2015

fredintoon said:
...Once you offset the front sprocket you are free from the 18T maximum tooth count ...

Then it'll hit the clutch pushrod...

fredintoon · Oct 19, 2015

TwoManyXS1Bs said:
Then it'll hit the clutch pushrod...

Hi 2many,
oops, you're right. Thanks for posting before Chris started cutting metal on that.
OK Chris, the bigger sprocket idea is not gonna work, sorry I goofed up.

TwoManyXS1Bs · Oct 20, 2015

Fred, my brain fart days are scheduled for the 18th of the month.
I think I need to pencil-in an extra two each month.

Are yours on the 19th?

rockhead · Oct 20, 2015

Try here http://xs650widetire.webs.com/

fredintoon · Oct 20, 2015

TwoManyXS1Bs said:
- - - Are yours on the 19th?

Hi 2many,
for me these days the brain fart is becoming more of a chronic condition to be guarded against.
I can claim that on the 19th my mighty intellect was befogged by the Canadian general election.

nashville Chris · Oct 20, 2015

rockhead thanks man that kit is just what the dr. ordered
Try here http://xs650widetire.webs.com/

member3480 · Oct 21, 2015

You can buy a offset sprocket from any sprocket company. I have use SPROCKET SPECIALIST for years and you really don't need more that a 1/4 inch offset for what you are doing and I would switch to 530 chain and sprockets if you have 630.

nashville Chris · Oct 21, 2015

awesome DaddyG. :thumbsup:

So you don't think its necessary to space the side cover or use extended clutch rod?

member3480 · Oct 21, 2015

The last one I did I cut the back half off the cover over the sprocket and didn't have to change anything.

nashville Chris · Oct 21, 2015

shaweet! I like cheap and I like to make it my own. I would have bought the kit if that's what it takes to get the look I want but I would rather make my own.

fredintoon · Oct 21, 2015

DADDYGCYCLES said:
You can buy a offset sprocket from any sprocket company. I have use SPROCKET SPECIALIST for years and you really don't need more that a 1/4 inch offset for what you are doing and I would switch to 530 chain and sprockets if you have 630.

Hi DaddyG,
you sure about that 1/4" being enough offset?
as I understand it, Chris wants to run an 8" wide tire instead of the stock 5" wide tire and not dogtrack the wheel.
OK then, the chain on my XS650 clears it's stock 130/90-16 (aka 5" wide) tire by just enough that the chainguard will fit between and I don't suppose an 8" tire should be run much closer than that.
So, if the tire is 1-1/2" wider each side how can offsetting the chain by just 1/4" gonna work?

nashville Chris · Oct 21, 2015

what size chain are you running on yours. I am wondering if that's not why daddyg suggested going to a different size chain to give more room?

fredintoon · Oct 21, 2015

nashville Chris said:
what size chain are you running on yours. I am wondering if that's not why daddyg suggested going to a different size chain to give more room?

Hi Chris,
I'm sure DaddyG did a typo when he said 630 and that he meant to say 520.
That is, if you were running the alternative 520 (5/8" pitch x 1/4" roller width) chain & sprockets you should swap back to the stock 530 (5/8" pitch x 3/8" roller width) chain & sprockets.
FYI, roller chain is specified in 1/8ths so a 630 chain is 3/4" pitch x 3/8" roller width.
XS650s always came with 530 chain & sprockets.
Yes, one could get 630 sprockets custom made but the largest that'd fit on the transmission would be a 14T.

fredintoon · Oct 21, 2015

solo2racr said:
Ya have to re-pitch the rear sprocket as well. So 14T is a non issue. Gear Ratios are about diameters, not number of teeth.

Well gee Solo,
I bet you could count all the way to 22 if you took your shoes off.
Of course 14T is an issue, it's the biggest 3/4" pitch sprocket that'll fit into an XS650's sprockety place.
And if you wanted to go that route you'd most likely be able to calculate that you'd need a 28T rear sprocket to maintain the stock 2 to 1 ratio.
BTW, do you remember back in the 1970s when you could get aftermarket chain & sprocket kits to swap your 530 series chainset to a 420 duplex?
Do that on an XS650 and you could run 22T (see, you could count it?) x 44T duplex and wouldn't that look trick?

fredintoon · Oct 21, 2015

Hi solo,
sorry about the confusion, I was attempting to dumb down my post to your level of understanding.
BTW, marble & sandstone have about the same density, an SG of ~2.7, about same as most aluminum alloys.
Perhaps you meant hardness?

member3480 · Oct 21, 2015

Fred I have done the 200 on a Harley 4.5 wheel with a 530 not 520 and only used a 1/4 inch offset and had to cut up the back of the cover for sprocket. You could do a 1/2 but that's as far as I would go without a bearing support. I had room for chain but I did have to stretch out the hard tail from 8 1/2" to almost 10" to make it fit and rear wheel line up.
The sprocket company I deal with only make 630 and 530 offsets. I guess you could take two 520 spocket's and a good machine shop and make up on. I think the kit that was offered with the plate was only 1/4" offset but I never seen one so I could be wrong. I always made up my own or bought them for my drag bikes. Also rim size makes a difference too.
Fred never did a 16 wheel with a 200 so maybe that would make the tire fat because its only 3.5 wide stock. I know a 160 on a 16" wheel is tight. You can also go to a 5.5 from a GSXR and do 200 but axle much bigger. Here is a KAW I did with a XS650 aftermarket kit.

member3480 · Oct 21, 2015

Also just to give you some ideas here is a 4.5 Harley wheel with a 160 tire and no offset stock .Both of these are 18x4.5

member3480 · Oct 21, 2015

I just looked up my notes and the white bike had a 120 on it at first then a 140 . Don't know why I changed the wheel and tire unless it was one of those 1 " axles that I used 3/4 spacers but didn't like the spacers. Now I know I am getting old got to go back to notes. But check this one out a guy did check out the cover and its a 240 tire.

Help finding off set sprocket for a 200 rear hardtail

Nashville Chris

Fred Hill, S'toon.

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Fred Hill, S'toon.

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Nashville Chris

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Fred Hill, S'toon.

Nashville Chris

Fred Hill, S'toon.

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Fred Hill, S'toon.

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