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Post by cycomoto on Jun 3, 2008 12:37:48 GMT -5
I just finished mounting a 1980 Yamaha SR500 to a 1970 Bingham MK I sidecar. It took it's maiden voyage this weekend for the Atlanta Pediatric Brain Tumor Foundation Ride for Kids. It looks and rolls great. Here's a picture.  I'll get a couple more up soon. I want to convert the wheels from Mags to Spokes. I think I have what I need to get it done. But I wanted to run it by the forum to see if my thinking is right. I have a spoked XS650 front wheel that should bolt right on. It's a single disc but has provision for a second. So I am going to convert it to dual disc by using a right side brake caliper from a Yamaha XS400. I want to run a 19 inch wheel on the rear so the front and rear match, kind of like a dirt tracker (it's a sidecar thing). So I am going to use a rear hub with drum brake from an XT500. It should bolt right into the stock swingarm. I was going to lace the hub to another XS650 19-inch front wheel and run it on the rear. The spoked rim is a bit narrower than the 18-inch mag but that shouldn't pose a problem. I need to get some stronger rear shocks for the extra load from the sidecar so I'll probably get them a bit longer to accommodate the 19-inch wheel. Now for the question. Anyone see any problems with this set up? Thanks for your help in advance. |
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sven
Full Member
Posts: 166
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Post by sven on Jun 3, 2008 13:16:42 GMT -5
I don't know much about sidecars, but as far as I know people who ride em normally try to fit smaller wheels like 15" in order to lower the center of gravity (and use cheap long lasting car tyres...)
The SR/XT00 cush drive isn't really well designed. I think it will wear out quickly if used in a sidecar. Better use a rear hub from a later dual propose bike.
Best regards
Sven
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Post by stevec5000 on Jun 3, 2008 13:25:43 GMT -5
I wouldn't convert to spoked wheels since they use tubes. Besides being a nuisance when you have to change a tire they are too dangerous to use on the street because the tube will go flat immediately when you get a puncture and there's no easy way to patch the hole unless you take the wheel off and fix the tube.
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Post by chew652 on Jun 3, 2008 16:43:43 GMT -5
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Post by cycomoto on Jun 3, 2008 17:38:32 GMT -5
Don't think I'll need a conversion kit because I'll be using an XT hub which is already properly spaced for the SR swingarm.
Good point on the cush drive. It may wear out. But at least it's replaceable. I think the cush drive on the SR and the XT are the same? I don't think the TT hub has a cush drive? Does the TT hub fit in the SR swingarm without modification?
Not worried about using cheap car tires. Avon sidecar tires are under $80 each and will last long enough. I am not going to slog a ton of miles on the rig. I ride my kids around the neighborhood and will take it to a few rallies/shows.
I like, or don't mind, tubed tires. Being a dual sport rider, I have changed so many trailside tires that I think I can consider myself an expert. Patching a tube is a piece of cake. Especially when you don't have to worry about the bike tipping over because it has the sidecar. Plus, if both wheels are 19-inch then I can swap tires and tubes as needed.
I want spokes because they look way cooler. More vintage. I understand that they may not perform as well as the cast wheels. But heck, it's not like I am riding the wheels off of it now anyway.
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Post by colinjay on Jun 3, 2008 20:59:18 GMT -5
You are correct, the TT500 rear wheel dosn't have the cush-drive unit, it also has a slightly larger brake drum, so you would need to use the TT500 brake plate and shoes etc. The TT wheel also has a double bearing on the brake side so would be a bit tougher. It will fit into the SR swingarm with out modification, as I used one in my cafe racer before changing to a disc brake wheel.
Having run a TT500 with an offroad sidecar, I would get the wheel (either TT or XT) relaced with the heaviest gauge spokes that can be made too fit (6 gauge I think). Otherwise, go for it! I still want to get another outfit going on one of my XT500, oneday!
CJ
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Post by davedunsboro on Jun 4, 2008 5:04:04 GMT -5
Nice rig !Wouldn't mind a few close up pics of the mountings of your sidecar if possible cheers Dave
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Post by cycomoto on Jun 5, 2008 21:13:41 GMT -5
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Post by stevec5000 on Jun 5, 2008 21:24:22 GMT -5
Does the gearing have to be changed much in order for it to be able to pull something that big? How fast will it go?
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Post by cycomoto on Jun 5, 2008 21:35:36 GMT -5
Does the gearing have to be changed much in order for it to be able to pull something that big? How fast will it go? Stock gearing is adequate. But I will probably bump the front sprocket down by one and the rear sprocket up by two or three teeth, more when I switch to a 19-inch wheel. I can give up a little top end for a bit more grunt on the bottom. Right now it will pull up to about 70 mph. The chair weighs about 160 lbs without ballast. I like to run with about 80 lbs of ballast. |
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