GSXR Rear wheel on an SV?

Steve runs the 5" rim with the 180 Diablo Supercorsa SC0 or SC1 or same compounds in the Pirelli Superbike slicks dependant on which circuit. GSXR600K7 front end with 20mm ohlins kit and springs and modded Ohlins shock. Turns real sweet, sticks like s*it to a blanket and stable as stable can be. Good enough for a 1.14 round Snett and a 100mph average lap of Thruxton!!..not bad for a shopping bike LOL!!!

Cools thats my favourite tyre....

Currently I'm mid build but I have GSXR600 K1 front end and Im sticking the CBR wheel in the rear with new spacers.

I also have a benelli tornado rear shock which has adjustable ride height, what height do you normally run in this configuration and I'm assuming I need modified dog bones.

[yorkie_chris]

Most important advantage I see is 180 race takeoffs are cheaper and more plentiful than 160s

Dymag says that 1 lbs of rotational mass equals 8 lbs of weight elsewhere on the bike... I do not know how much truth is in that statement...

The difference from the 5.00 inch CBR600 F3 rear wheel to the newer 5.50 inch GSXR 600/750 rear wheel is weigh... Those older CBR600 F3 rear wheels are as heavy as the RF900 / Bandit 1200 rear wheels...

That means if you can save 4 -5 lbs of weight on the rear wheel... You could possibly be saving 32 -40 lbs (?)

The 5.50 inch GSXR 600/750 rear wheel is even lighter than the 4.50 inch stock SV650 rear wheel...

Luis

[yorkie_chris]

It is not mass that matters, it is rotational inertia. You could have a heavier wheel be effectively lighter if it carried it's mass in the hub rather than the spokes.

Also if there is gearing involved then it is rotational inertia multiplied by the gear ratio squared. So losing a pound off the clutch or flywheel would be a massive loss of effective weight. Far more than same weight on other part of bike.

Edit:
http://en.wikipedia.org/wiki/List_of_moments_of_inertia
read here... see how much r^2 comes up in formula.
Also look up referred inertias, that is nice way to work out effect of reducing some inertia depending where it is on drivetrain.

Luis,

I'd love to buy your mod but at 200 quid plus shipping plus the GSXR wheel and disk its too expensive I'll stick with CBR 600 wheel which I got 2 of (one for wets) for 80 quid inc shipping

Originally Posted by SVXR650

Dymag says that 1 lbs of rotational mass equals 8 lbs of weight elsewhere on the bike... I do not know how much truth is in that statement...

The difference from the 5.00 inch CBR600 F3 rear wheel to the newer 5.50 inch GSXR 600/750 rear wheel is weigh... Those older CBR600 F3 rear wheels are as heavy as the RF900 / Bandit 1200 rear wheels...

That means if you can save 4 -5 lbs of weight on the rear wheel... You could possibly be saving 32 -40 lbs (?)

The 5.50 inch GSXR 600/750 rear wheel is even lighter than the 4.50 inch stock SV650 rear wheel...

Luis

Originally Posted by yorkie_chris

It is not mass that matters, it is rotational inertia. You could have a heavier wheel be effectively lighter if it carried it's mass in the hub rather than the spokes.

Right, and F3 wheel is not that much heavier than gsxr.

http://forum.svrider.com/showpost.ph...&postcount=981

OK, just to throw another question into the mix - would I benefit from running a 180 rear on my 1998 CBR600F3 when in trackbike mode? When I start racing it has to be on a 160 though, just wondering how much better it'll be with a 180 in the rear cos I can nick Dannys old Metzeler Racetec scrubs that come off his 675.

I know alot of steely racers fit 180's as they give the tyre a pointier profile which helps the bike turn into the corner the trade off is its less stable in a straight line. Obviously this is dependant on the profile of the tyre to begin with i.e. it accentuates the profile.

[yorkie_chris]

Originally Posted by zadar

Right, and F3 wheel is not that much heavier than gsxr.

http://forum.svrider.com/showpost.ph...&postcount=981

but is .5 inch narrower too. I don't know how to find inertia as it is not constant across radius. I'll have a gander.