Does anyone have handle on how much lighter a 900RR wheel is as compared to the stock 919 wheel? I've read the 900RR is supposed to be noticeably lighter and a simple interchangeable replacement.

Same question re a F4i front vis a vis the stock 919 wheel.
Seeing as I have a F4i forks going on, changing to a F4i front wheel should be a simple proposition, as long as the fork tube to fork tube distance in the clamps is the same.
(Counter to this is posts about using F3 wheels and not F4i? Hmmm, if so, why?)

Would appreciate any advice on the above.
My pursuit is reduced rotational mass, as long as I can do it fairly cheap.

I am not sure of the weights. I believe most people are doing wheel swaps for the look more then the performance. I noticed a pretty big difference when i swapped mine, but i changed so much during last winter its hard to pinpoint what parts helped the most.

The reason for the F3 front is that it matches (both 6 spoke) the 900RR rear perfectly. The f4i has three spoke wheels and it looks almost identical to the stock 919 setup.

Next time i change tires i will strip them down and get you some spec weights on my 900RR/F3 combo.

Thanks HeliMech!
And I now realize that what I thought was a F4i front was indeed that of an F3.
I won't change unless there is worthwhile weight reduction.
I've already got a spare set of stock wheels, those slated for being powder coated red.

Ive often wondered how much weight could be safely machined off a standard wheel? i wonder if anyone has ever tried?

Yup. I'd do it for looks. 5-spoke/6-spoke looks the business compared to the 3-spoke stockers.

I'm due for a new tire on the front, maybe in the spring.
I could weigh the front 6 spoke wheel then.
If I weighed the rear wheel with the tire on that would
probably not be too accurate?

Come on, really? You must have some tread left on it. I'd probably run it another couple thousand kms.

How would you know when to stop machining off weight, i.e., where's the point at which it's no longer safe?

The wheels are already hollow, so I'm not sure what you'd be able to machine off, or where for that matter. Don't think you'd gain too much benefit from shaving off a few ounces. Most likely you'd have to find a rim of a completely different alloy or composite in order to shave weight.

Very little thread left.

http://www.fireblades.org/forums/hon...el-weight.html

If you want the to go for a lighter wheel, go with Carbon Fiber wheels. They are pricey though BST Carbon Wheels - OPPRACING Products