More wheel weights

[John Kat]

I had a couple of wheels lying around and I decided to weigh them
First 2 front wheels: a 19" spoked wheel with later GS 1000 disks and a GSXR 750 G 18" wheel with chinese disks.
And the winner is...GSXR 750 at 11.6 kg versus GS 1000 at 13.4 kg
Next 2 rear wheels: a 2.5*18" GS 1000 S and a 3.5*17 GS 1150 both with disks.
The winner is....GS 1000 S at 15.6 kg versus GS 1150 at 16 kg.
Not much difference considering the 1150 had a 130 tire versus the 120 on the 1000

 

[Guest]

Neat stuff to know. I would have thought (GSXR 750 at 11.6 kg versus GS 1000 at 13.4 kg) there would have been a greater difference between them - more for the steel rim and less for the cast. But that difference alone in unsprung weight is a world of difference. However, I'm stuck in the spoke era and will always lean towards spokes for looks.

 

[posplayr]

Neat stuff to know. I would have thought (GSXR 750 at 11.6 kg versus GS 1000 at 13.4 kg) there would have been a greater difference between them - more for the steel rim and less for the cast. But that difference alone in unsprung weight is a world of difference. However, I'm stuck in the spoke era and will always lean towards spokes for looks.

A big part of the weight difference on the front is probably due to the more modern rotor. Of course a real parameter for comparison is the moment of inertia. If the weights of the wheels are the same without rotors then the probably have similar moments of inertia as well. Moments of inertia referees to the Sum of weight at a distance from center of rotation.

 

[John Kat]

A big part of the weight difference on the front is probably due to the more modern rotor. Of course a real parameter for comparison is the moment of inertia. If the weights of the wheels are the same without rotors then the probably have similar moments of inertia as well. Moments of inertia referees to the Sum of weight at a distance from center of rotation.

The moment of inertia will hurt acceleration and braking for sure!
In fact I had measured the front wheels previously without the disks ( but with the tires). Here we go:
GSXR 750 G ( 18*2.5): 8.6 kg
GS 750 spokes: 9.9 kg
GS 1000 E cross spoke: 10 kg
GS 1100 Kat 3*2 spokes: 10.9 kg
GSXR 1100 K ( 17*3.5) : 9.8 kg
I believe there is no lighter production front wheel than the GSXR 750 F/G!
The same goes for the rear by the way