Modern rotors on vintage spoked wheels???

[biker_reject]

I am a newbie here and had looked at BigSherm's post on matching up modern sport bike steering stems to vintage bikes. I think he is a great humanitarian and all around bad-ass for giving us such helpful information. Now with that said, I was wondering how one would go about finding rims with modern sport bike widths and would a rim like that match up to a vintage hub? I have seen a few cafe bikes on the net with spoked front wheels with modern dual rotors and carriers but didn't have the forethought to save the pics! I will check out some chopper forums to see if those guys know anything about this...

 

[rockcitycafe]

I'm actually running michelin pilot powers on converted 17x2.5 rims on my cb750, 140-70 in the rear and 110-70 in the front. spoked rims with tubes... it can be done

 

[biker_reject]

Dude, how did you do this? For example; where did you get the rims? Did you use the original hubs? Do you have pics?

 

[Tim]

Right off the bat, you need a rim with the right number of spoke holes. Then you call Buchanan Spokes and tell them the rim and hub combo you're using, and order custom stainless spokes.

At least that's how I'd do it Gotta be 100x more complicated though, considering spoke angles etc.

 

[rockcitycafe]

http://dotheton.com/index.php?topic=7254.30 pics are there, I'm running the stock brakes though, but the rims or spokes won't affect the brakes, as they mount on the hubs... worst case scenarion, you'd have to come up with some kind of adapter for bolt locations

 

[RickyRAcr]

Check out dynoman.net to get EBC rotors that are made for the CB750/500/etc etc hubs. They are full floating and cross drilled, but not directional, so buy 2 and flop one on the right side. I have a set, but they are in the "new parts to build the 750" pile while I finish my CB500. I don't have pictures of them mounted They are MUCH lighter than the stockers. As far as the wheels go, Buchannan has "wide" wheels from Excel and they will custom drill the rims to match your hubs. "Modern" bikes use something like a 3.5" front and a 5" rear. That's do-able with a '77-'78 sproket carrier. If ya wanna get crazy with some 200 width tires, you may need offset sprockets. Go to cyclexchange.net and spend a while there. they have good stuff, good prices and LOTS of cool info on what is what. They have an explanation of the different sproket carriers etc etc. Hope that helps!

 

[leftlaneguy]

I am a newbie here and had looked at BigSherm's post on matching up modern sport bike steering stems to vintage bikes. I think he is a great humanitarian and all around bad-ass for giving us such helpful information. Now with that said, I was wondering how one would go about finding rims with modern sport bike widths and would a rim like that match up to a vintage hub? I have seen a few cafe bikes on the net with spoked front wheels with modern dual rotors and carriers but didn't have the forethought to save the pics! I will check out some chopper forums to see if those guys know anything about this...

Yes, of course it can be done. It all depends on how much $$ you want to spend, and how industrious you are. On my '78 CB750, I'm running 17" supermoto type wheels with Shinko Advance 009's 120 front, 160 rear with Galfer wave rotors and ISR calipers. Stock-ish suspension, ie: stock swingarm with Penske 3-ways and stock forks with CBR1000RR cartridges. LOOKS stock on the outside, not so much in the handling dept...

 

[Swagger]

Yes, of course it can be done. It all depends on how much $$ you want to spend, and how industrious you are. On my '78 CB750, I'm running 17" supermoto type wheels with Shinko Advance 009's 120 front, 160 rear with Galfer wave rotors and ISR calipers. Stock-ish suspension, ie: stock swingarm with Penske 3-ways and stock forks with CBR1000RR cartridges. LOOKS stock on the outside, not so much in the handling dept...

I'd love to see pics of this one, especially the cartridge bits in the CB forks! What a boon for someone looking for modern handling in a vintage bike.

 

[leftlaneguy]

I'd love to see pics of this one, especially the cartridge bits in the CB forks! What a boon for someone looking for modern handling in a vintage bike.

I'd love to be able to show off the internals, but alas, I didn't bother to take pics.
Suffice it to say, it wasn't very easy, but not as hard as you might think. The cartridges actually fit quite well into the Cb's fork tubes. Modification of the tube @ the bottom, and a new sleeve on the top of the cartridge were the major mods required. I could do another one, possibly... I have a spare fork, and a unusable cartridge. Get the process accross at any rate.

Y'all can visit my site for pics, keep in mind the site is under construction, and will be getting more content over the next few days. www.cerberusmotorcycles.com

 

[rockcitycafe]

140 is too wide for 2.5" rim.
I know you can get it on there but its severely pinched at beads and 'low profile' isn't. (I've done it, wore out in 2,000 miles)
Pair of correct width rims, built onto hubs by Buchannans will probably run you around a grand

PJ

i'll have to talk to the guy that put it on, he checked through the catalog for the largest width that would go on that rim, and the dealer book gave that tire...

i'm still trying to find a wider rim for it on egay, so i might wind up with something wider on the next replacement

 

[Fishhead]

Heres a link with suggested tire sizes for rim widths.

http://www.hagon-shocks.co.uk/WheelTab.htm


I've been putting newer brake caliper and discs on older bikes for years.

http://www.geocities.com/fischervintagecycle/Fischheads.html

The first picture is recent brake kit that was made .
KZ 900, 6 pistons, 310mm discs

The second picture is a fuzzy little dog with his tongue sticking out. FYI

Fish

 

[biker_reject]

Nice! But, why are they called "Fishheads"???

 

[Fishhead]

Nice! But, why are they called "Fishheads"???

With a last name of Fischer, I get called Fishhead alot.

A friend (who calls me Fishhead) called my brakes "Fishhead Brakes" and since then it just stuck.

Fish

CB 750 Rear Disc brake (front hub laced to an 18 inch hoop and converted to rear use) and an XS 650 rear disc brake set up

 

[Swagger]

Mr. Fish.....um......

How do you accommodate the cush-drive on that front hub conversion?

 

[tobiism]

Mr. Fish.....um......

How do you accommodate the cush-drive on that front hub conversion?

My guess is that you don't. My Harley has no cush-drive and is chain driven. With many many miles on it I don't see any reason why the cush drive is necessary.

 

[Fishhead]

My guess is that you don't. My Harley has no cush-drive and is chain driven. With many many miles on it I don't see any reason why the cush drive is necessary.

Yes, the cush drive was removed/deleted.
The front hub to rear spoked wheel replaced a Shelby-Dowd mag wheel that also deleted the cush drive. The wheel has been on the bike for more than 2 years and there hasnt been any problems with it. I do pay more attention to the spokes and reguarlly check them (to be on the safe side). So far, so good, with no broken spokes or other funk.
The Yamaha XS 650 people do this type of conversion alot (Front to rear wheel) and Omars sells an adaptor kit to do it with. Thats where I got the idea from. I wanted a spoked wheel with a newer disc brake set up and the stock 750 F spoked rear disc brake wheel wouldn't allow a newer disc (The F uses a big disc with a large bolt mounting pattern).
Fish

The chunk of aluminum that is keeping the wheel from rolling is what the sprocket adaptor started out as. An extra bearing was added to the outside of the sprtocket adaptor.

 

[Swagger]

Cool! I love the look of a small diameter hub out back and have been thinking along these lines for a while.
It kinda funny, even my S90s have a cush system. Seems silly in little bikes though I could see the need in larger more powerful rides...though a lot seem to have a cush built into the clutch basket too....hmmmmm

I like the idea of the extra bearing too, nice!

 

[brewtown16]

holy jesus...

 

[chrisf]

I built a fireblade/cbr900rr-engined car and didn't use a cush drive. Instead I ran an adaptor where the sprocket used to be and ran it to a driveshaft, which, in turn went to the rear diff. Some cush in the drivetrain would have been nice, but I never had any problems with the gearbox. And I had about 4 hours of tracktime on that engine...not the nicest environment. Basically 4 hours at 13k rpms in 100+ degree heat!

That chain should take up some of the lash. I have no idea it that's good or bad, but it has to be better than than directly attaching the engine to the wheels--which is effectively what I did.

--Chris

 

[rockcitycafe]

there's actually probably space in that aluminum hub for a rubber drive, what you could do is get some rtv silicone and machine two pieces to mate with blades sort of like the stock hubs, and just fill the space with the mixed rtv, when it cures it would be nice and rubbery