YoshiHNS

Added in mrmatt's note that I had from a while ago. It seems we are going about this in two different ways, and that the wheel offsets might be different.

I have Matt's notes in a PM. If he doesn't post up soon, I'll add them in. Right now I have to get back to getting my car fixed.

Fixed the problem with the updated chart not uploading properly. The wheel is only 0.05" too far in. I should be able to water cut a spacer to push it out and still have the wheel contact the counterbore on the pins. IIRC, the step on the four pins for the wheel is 0.100". Either that, or that's the depth I cut it to in the wheel. Will have to check. If not I can always make 0.05" washers to sit on the pins and call it a day. The sprocket is 0.072" too far in, which isn't much either. That's another water cut spacer and I can call it a day. Unless the 520 conversion throws a curve at me.

Yes. All measurements in inches and lbs. True machinist is going to be dealing with the english threads on the spindle. Not sure if it would be best to try and use a lathe to cut the thread, or just cut the OD and use a die.

g That's about right. The Aprilia Mana front wheel I got for peanuts weights more than the 848 rear, the VFR front, and the R1 front. It's around 10.5, whereas the 848 stock rear is 9.8lbs. Only good thing about the Ape wheel is that I got Galfer wave rotors for dirt cheap as well, but now have to deal with the 22mm ID for the axle. It would be interesting to see how much the ducati swingarm weights. If I didn't mention it before, the VFR swingarm complete was around 26.5 lbs. +/- 0.5lbs.

UPDATED with weights and wheel measurements.

If you're really interested in going for dropping as much weight as possible, you might want to just go for a conventional swingarm. You'll lose a lot more weight that way. This should really be considered more of an extensive cosmetic mod. Heck, only reason I'm doing it is because I found a steal on that ducati wheel that I had to weld up and repair.

Why are you trying to swap over the entire swingarm?

Not even close. You could possibly machine it down and weld some back in, but it's over an inch wider, not to mention much heavier.

*** reserved for rear caliper solution.

***reserved for spacers, parts, and other modifications

More info from him can be found in the thread linked in the first post.

First and foremost, want to thank Mrmatt for his post a while back that make me decide to do this for my project. Here's the link to his thread. Now that I am finally getting around to doing it, I can verify all the measurements he took. Lots of the pictures are just of measurements, but this way it can't be questioned in the future. *** Not finished yet. Still need to take measurements with the wheel on to get final info. Forewarning, you are going to need either a very large snap-ring plier, or you will need to modify a pair of needle nose pliers to get the snap ring off the eccentric. This is the hardest part of the disassembly. Snap ring pliers this size are $35-$50. Otherwise you can grind down the tips of the HF 90 degree needle nose pliers with the orange grips. The VFR ring is fairly easy. The triumph one is a dog. So lets begin. First things first. Injure yourself in such a way to make tool handling painful and difficult. As a side note, rags are not sufficient protection against 20ft long chips. - Next, find yourself a comfortable environment. 88F and 70% humidity will do nicely. Then find the mess that someone has left behind at your work area, and clean it up. - Wiped down and chip free surface. Grabbed some blocks, clamped the swingarm down, and got to taking measurements. - Measurement for inside of sprocket carrier for VFR - VFR sprocket carrier thickness. - VFR sprocket carrier surface to surface double check. - VFR swingarm surface to wheel mounting surface. - VFR wheel mounting surface thickness. - The hammer lies upon its prey. Triumph eccentric tapped out and removed. It came out nice and easy. I couldn't get the caliper hanger off, so I had to use the hammer to give it a couple of light taps to get it started. Once the caliper hanger was on the step, it came right off, so must have just been a little dirt keeping it from coming off. - So nice of triumph to add never-seize. Probably helped with the removal. - Either Honda didn't bother putting any grease on the eccentric, or it all dried up and washed away. The honda eccentric was pretty difficult to get out. Had to use the mallet to get it to the caliper hanger, but the eccentric kept getting stuck part of the way out. Turns out that there was so much dirt and debris in there that it would get stuck between the middle of the eccentric and the swingarm and bind everything. Took lots of shaking and blowing junk out to finally get it out. - Total height of the triumph eccentric - Triumph eccentric swingarm section. - VFR eccentric total height. - VFR eccentric swingarm section. - Just for giggles. Triumph eccentric weight. - Honda eccentric weight. - The VFR swingarm after removing the eccentric. You can see that the surfaces aren't very clean, and there's still some dirt in there. - Time to toss the Triumph goodies in there. Fresh new coat of never-seize on the triumph eccentric - Sitting nice and flush - Nice and flush on this end too - Somehow I feel like I have just made it heavier. Also, you need to use the triumph caliper bracket to have the eccentric sitting where it is supposed to. The VFR caliper bracket has the same ID, so if you really wanted to use the VFR hangar for whatever reason, you could possibly make a spacer for it. - Triumph rotor carrier thickness. - Thickness of sprocket carrier for triumph bit. - Triumph wheel mounting surface to swingarm surface - Triumph sprocket carrier surface to swingarm surface - VFR Wheel offset 848 Wheel Offset Weights are added to the chart. I don't think anyone wants pictures of all that. You can go in the photobucket album if you really want. So here's a chart of the differences in sizes and some weights End result is that I gain 0.5 lbs by doing the swap for the opportunity to run a single nut wheel. I have a VFR wheel with a tire and the 848 without, and still have to consider the caliper, caliper hanger, and the rotor, and the wheel nuts, so that's not the total weight just yet. Looks like everything is still pretty close to where it should be, unless someone finds a fault in my math and measurements.

But as KGS mentioned before, this might not be enough in city riding or traffic jams. Okay on a track bike when you're always moving. But the electric water pump will circulate more water at idle than the stock water pump, since it's separate from engine RPM.

Didn't he remove the fan?

You make a good point. You would have to keep the original VFR braking system to get around that factor. Otherwise it is a gamble. Or the total brake piston area would have to be the same, or close to it. The entire caliper is filled with fluid, so volume isn't the issue.

Using a desktop fan is a no. They may be skinny enough, but unless you crank the volts up on them, they won't spin anywhere near as fast to make any impact on the temperatures.

That was more along the lines if he used the VFR wheel on the RC51 forks. But not sure if the wheel IDs are the same. If they swap over, then your only worry is making sure your calipers match the rotors. Think the axles are different sizes anyways, so it wouldn't work.

But will the rotors still fit the calipers once you have your adaptor? That would be my first concern. They are 320mm. Think the VFRs are 296mm.

Guess there's a bunch of research to be done. It would be even easier if you could just swap the forks and keep the VFR wheel. You didn't mention what wheel you were going to put on there. I don't think the VFR rotors swap over to many other bikes though. Why bother with the adaptors to make conventional brakes have radial mountings? Why not save the headache and just use what calipers come with the forks?

Unless it's a trackbike, don't do it.

The difference between pure gas and E10 in my 4th gen was going from 50mpg easy to maybe 42mpg. Haven't had any running issues though.

Sounds like you know enough to try something different. Glad it worked out.