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Post by bullit on May 24, 2009 7:52:06 GMT -5
I need some help here guys, I want to run a spoked rear wheel with a disc brake setup. From what I have gathered, the XS never actually came with one, but I have seen pictures of some cafe's using this setup. I saw Omar's kit to use a front rim, but I find it grossly overpriced. Does anyone have experience with this?
I will be re-spoking my wheels anyway, so if I need to put a different hub into the rim hoop, that would be fine as well.
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Post by dgfischer on May 24, 2009 8:25:47 GMT -5
Omars kit would be the easiest way of getting it done. I have done the same thing on my CB 750 SOHC using a front hub laced to an 18 inch hoop, converted the bearings to 20mm, and machined up a sprocket adaptor,etc. Custom machining these parts gets expensive when compared to buying Omars kit. You would still need to figure out what caliper and master cylinder to use. DG ![]() ![]() |
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Post by bullit on May 24, 2009 9:31:06 GMT -5
Omars kit would be the easiest way of getting it done. I have done the same thing on my CB 750 SOHC using a front hub laced to an 18 inch hoop, converted the bearings to 20mm, and machined up a sprocket adaptor,etc. Custom machining these parts gets expensive when compared to buying Omars kit. You would still need to figure out what caliper and master cylinder to use. DG ![]() I've got the caliper and master cylinder thing beat, I'm using rear-sets from a 04 Yamaha R6, which have the brake pieces already there. I am hoping to find out if there is an existing rear hub that can be laced into the original akron hoop. The last issue of Cafe Racer Magazine had an XS with that setup, but didn't explain it at all. ![]() |
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Post by xsleo on May 24, 2009 13:51:21 GMT -5
I have been thinking along the same lines. Suzuki and Kawasaki used a disc brake , spoked wheel in the late 70's to early 80's. These wheels have the cush drive, a rubber pad between the sprocket plate and hub. I haven't found one in a reasonable price yet. I think it would be an easy swap. If you use the whole wheel and brake setup. Maybe a bit of spacing work, but no worse than getting a disc brake on the rear of my 75.
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Post by crazypj22 on May 24, 2009 15:09:46 GMT -5
There's probably a real good reason there isn't a spoked rear disc wheel.
Personally I don't think its a good idea to use a spoked front hub modified for rear.
The wheel has to drive as well as hold bike up.
With inline four, even with higher power output, there is less stress on individual spokes (power pulses smaller and are closer together)
Front hubs are smaller diameter and narrower than rears so you have less triangulation.
On a race/track bike its inspected regularly (plus its carrying a lot less weight)
I guess the extra flex may be some use somewhere?
PJ
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Post by dgfischer on May 25, 2009 9:49:32 GMT -5
I thought I saw a link a long time ago to a spoked disc brake rear wheel but I couldnt find it anymore, so I did some research. Yamaha did make a spoked rear disc brake wheel for the TZ series. Finding one will be hard to do and once found it will probably be expensive as "all get out" because it is for their factory race bikes, making the Omars kit seem very reasonable. Heres a link www.babbittsonline.com/pages/parts/viewbybrand/2/Yamaha.aspxFill in the drop down boxes on the left hand side= "Yamaha" , "motorcycles", "1976" , TZ350 and then follow it to "rear wheel". The Omars kit with an 18 inch RD front wheel would seem "economical" in comparison ( I think the TZ spoked disc brake rear wheel (bare) from a long time ago went for over $600). DG |
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fitz57
Junior Member
77d XS 650, 80 Streetracker, Champion framed SR500, 07 Yamha WR450. Projects, SR500 tracker, TT500
Posts: 59
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Post by fitz57 on May 25, 2009 11:07:01 GMT -5
I don't see a problem with a XS650 front spoke hub on the back. A larger bearing than stock is mounted in the adaptors that puts the bearings about 2" farther apart. However it would be nice if the spoke flange distance was a bit wider. Also you can use the stock XS650 rear disc set up.
Long time Flat track racer Jim Henry makes a very nice set for a lot less than Omars. He can also make them with a quick change knock off setup also. You can contact Jim at racingjim90n@yahoo.com
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Post by bullit on May 25, 2009 18:42:29 GMT -5
Maybe I'll check into late model dirt bike wheels and see about making something like that fit? Never know, it might work.
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Post by crazypj22 on May 26, 2009 1:10:51 GMT -5
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Post by bullit on May 26, 2009 19:18:20 GMT -5
The harley hub won't work, as I want to retain the aluminum outer hoop to match the front. I was looking in e-bay and it appears that a Kawi KLR650 has a 36 spoke hub, with disk brake, I may try to acquire one of these and try to figure out the spoke situation. |
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Post by dgfischer on May 27, 2009 8:25:57 GMT -5
I was looking in e-bay and it appears that a Kawi KLR650 has a 36 spoke hub, with disk brake, I may try to acquire one of these and try to figure out the spoke situation. Well, I'm not trying to piss on your parade but.. It can sometimes be a "Crap Shoot" when you mix/match rims and hubs. Just because a hub is 36 spoke doesnt mean it will fit your hoop. And then you may have to figure out bearings, sprocket alignment, disc brake,etc. Rims have the angle of the spoke holes drilled differently. A rim drilled for a large drum brake hub will have the spoke holes drilled at different angles than a smaller disc brake hub. Putting a rim drilled for a small hub on to a large hub (and vise versa) can put the spokes on a bind and the spoke may be more prone to break if they are not a straight pull (from wheel to hub).Width of the hub also has a bearing on the angles of the spoke hole drillings on the rim. Here's the same rim that I converted to a rear disc (pictured above) laced to a large drum brake hub. Look at where the nipples and the spokes meet and some are on a bind (not a straight pull from rim to hub) and would be more prone to breaking. Most noticable at the 5 O'clock position. DG  img14.imageshack.us/img14/3424/alumrims.jpg |
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Post by crazypj22 on May 27, 2009 10:19:00 GMT -5
I have done the same thing on my CB 750 SOHC using a front hub laced to an 18 inch hoop, converted the bearings to 20mm, and machined up a sprocket adaptor,etc. ![]() Personally, I would use 40 hole for rear. The Honda wheels are 40 spoke on 500/550~750. What threw me is the laced 'Harley pattern' PJ |
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Post by bullit on May 28, 2009 19:51:19 GMT -5
My head hurts.
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Post by browder on Jun 26, 2009 10:28:15 GMT -5
there was somebody that used a kz750 rear a few years ago and i guess it was an easy painless swap but it'll be a 40 spoker--probably easy to get off e-bay and cheap
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Post by xsleo on Jun 29, 2009 2:30:53 GMT -5
crazypj22, if a disc brake on a spoked wheel is a bad idea, how come Harley has been doing it for 30+ years?
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