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Sportbike rims viable?

2.8K views 37 replies 14 participants last post by  jpwarrior  
#1 ·
I've searched around a bit on the forum and haven't found much about people using lighter weight rims on their bikes.

How heavy are the stock rims?
I've seen many, many posts about larger 250 rears robbing power, of course, but nothing on people using lighter rims than stock.

What sport bikes have compatible rims? There are more things to consider than just the size, right? The hub and mounts for the flywheel should be compatible, right?

I found a few websites on serious racing rims made from magnesium and other materials that end up being half the weight of stock sportbike rims.

Any experience???
 
#4 ·
R1 wheels work for the front. I know the 2001's are a "no mod" swap for the warrior. Most sportbike rears use a "cush" drive, while the warrior pulley is a "hard" mount to the rim. You would have to figure out a reliable way to hard mount the pulley to the rim because the cush drive and belt would probably cause a lot of slop in the drive line (just a guess.) Your other option would be to convert to chain drive on the warrior. Then all you have to worry about is correct spacing on the rear wheel, and the front sprocket off set. Either way you have to consider axle size, and brake location. I'm researching this idea myself.
 
#7 ·
(in my admittedly poor gary coleman impersonation) What you talkin' bout bigjim? I guess it's possible that your rear wheel is different from mine.... According to the terminology wheel makers use, a cush drive is a method by which the sprocket (or Pulley) is mounted to a carrier which has drive pins inserted into hard rubber isolators in the wheel. The whole assembley is held onto the wheel by a snap ring or another similar method. The warrior pulley (mine anyway) bolts directly to the rear wheel. The rubber belt on the warrior absorbs the driveline shock, negating the need for isolators in the wheel. If you have something different, please educate me with pictures. I would be interested in that set-up.
 
#8 ·
Doh!
I was afraid that there would be a bunch of work involved in conversion of the rear.

It's good to see that at least the front rim can be swapped out with aftermarket R1 rims. You can get 4 lbs magnesium rims for the front then.

I was hoping to get the 7 lbs mag rims for the rear too, but that might be too much work.
I wonder how it would ride with a super light front tire and the stock rear. It would look stupid due to the mismatching until I could figure out the rear...
 
#11 ·
Hey mod, if that's the case you have an extremely hazardous situation. Your retaining device is broken or missing. I had a retaining ring break on an old honda at 80 mph. The carrier wedged on the swingarm and locked everything up. The tire was flatspotted to cords, and the shaft that carried the front sprocket broke. Someone show me a pic of this warrior cush drive.
 
#13 ·
quote:Originally posted by dontcare1357

Hey mod, if that's the case you have an extremely hazardous situation. Your retaining device is broken or missing.

I believe there's an exploded view of it in the manual. I've put about 2500 miles on the bike since that happened, including the trip to Deals Gap. Everything is fine. The pulley is bolted to the pulley carrier which is part of the cush drive system and not fixed to any part of the wheel. The carrier has vanes(for lack of a better term). The wheel has wedge shaped cavities. The wedge shaped isolators fit inside the cavities in the wheel. The isolators are split down the middle in order to accept the "vanes" of the pulley carrier.

Maybe yours got fused together as your bike was pretending to be an asphalt surfboard. [/emoticons/emotion-2.gif]
 
#14 ·
dontcare1357, my two Warriors definitely have a cush drive.

I have replaced a total of four tires and the drive pully pulls right off the rim without having to unbolt anything. If you take your rear tire off, just pull up on the drive pully and it'll seperate from the rim. Those bolts you see on the pully don't hold it to the rim, they hold onto the rubber cushion.
 
#15 ·
So, since the Warrior apparently has a cush drive, does this make r1 rear rims direct bolt-ons, or are the cush drives different from one another? Are they the same number and spacings to the rubber cushions? Will the pulley fit in place of the rear sprocket of the R1 rim?
 
#22 ·
Wow!
Thanks guys! Those are great diagrams. I assume those are from the repair manual...

Phew!
I had no idea there were so many pieces. It does look like the rims themselves are similar if not identical in the hub area. It looks like just the inserts are different.

We may be able to just pull apart an R1 rear wheel and use Warrior inserts.
 
#25 ·
There are several threads pertaining to wheel mass. This is the first one that talks about lightening the stock wheel as opposed to the side-effects of ADDING mass to the wheels with things like the 250 rear wheel kits. I seen posts that say that you lose 15-20 horsepower from the added weight of going to the 250 rear wheel.

The theory is this:
If adding 15lbs to a 620lbs bike loses 15hp, wouldn't you gain double-digit hp(maybe 10 to 15) by losing 15lbs from the same 620lbs bike? I'm sure it's not a linear progression. Actually, you might gain more than 15hp from losing 15lbs of rotational mass at an 8.5" radius.

What else is there that you can do to this bike that would give you 15hp? Granted, magnesium rims would probably cost about $2k for a pair, but you also get the benefit of aesthetics.
 
#26 ·
huh, well that answers it for me. i'd like to see someone show me the dyno sheets on that. very interesting. i just figured it was a "make the bike lighter" thing. yeah, i mean how much was spent on air intake, pipes, and a PCiii! if similar money could be spent,.... huh. someone do it and get a before and after dyno. i'll pitch in on dyno time.