cbr rear wheel

Originally Posted by yorkie_chris

What difference would you expect?

Never ridden one with a proper 180 conversion, or looked overly close at the exact geometry, but I’d postulate it’d almost certainly make the bike steer slower. And then as the bike leans more and gets more up on the side of the rear tyre, make the front come off profile and potentially allow it to break free …

The first part about slower steering I expect to be 90% probable, the latter part would really rely on the amount of deflection in the tyres and all the angles of the dangles. In practice, under ‘normal’ riding conditions I doubt the front washing coz of the rear profile would come into play … but something to consider!

There is even a chance that the geometry works better with a 180 rear … I just don’t KNOW … I can tell you for certain it isn’t going to be the same as the stock format – it can’t be! And there is a good chance it will be ‘worse’ in one way or another!!

[yorkie_chris]

Stock geometry isn't really worth considering, since if I do this then there'll be gixxer forks on it and probably a jack up kit too.

Originally Posted by yorkie_chris

Stock geometry isn't really worth considering, since if I do this then there'll be gixxer forks on it and probably a jack up kit too.

In that case it could be really bad!!

I rode for a couple of months with one, but mine was accompanied with a raised rear end and also the gixxer front end. With all this, I had no complaints with slower steering at all. I was more than confident to get the thing down on its side, was bloody hard working on them strips though lol. My Dunlop Qualifiers were feathered after the North Wales rideout take 2.

Anyway, all this malarkee about slower steering. Never experienced it, but I was accompanied by a few other mods so possibly it may.

Originally Posted by Blue_SV650S

In that case it could be really bad!!

My second SV was a lot better than my first. First been standard, second with the mods Chris just mentioned.

[yorkie_chris]

I can make a fair job of looking at geometry, and looking at what forces are going where. But I have no idea where to start about tyre flex, so I guess the only way is to find someone who's done it before.

The slower steering bit: Would the larger rear be more stable? i.e more restoring force or simply be slower to react to anything? Greater gyroscopic forces involved as it'll probably be heavier, depending on the wheel.

To be fair boys, the SVs suspension is so shockingly poor as stock that putting a GIXER front on it and setting it up in a more ‘aggressive’ stance is going to transform how it rides!!

At the end of the day, a fatter rear WILL slow the bike … again, how can it not The only advantage of a fatter rear is that you can hook up better mid turn, it improves corner exit at the expense of ‘flickability’ … but lets face it, do you care about ultimate flicakbility and ultimate hookup … no you want your bike to look cooler!!

I am playing devils advocate really, but don’t assume fitting a fatter rear (alone) is actually an upgrade, depending on what you want to do with it, it might actually be a downgrade!!

[yorkie_chris]

Originally Posted by Blue_SV650S

At the end of the day, a fatter rear WILL slow the bike … again, how can it not The only advantage of a fatter rear is that you can hook up better mid turn, it improves corner exit at the expense of ‘flickability’ … but lets face it, do you care about ultimate flicakbility and ultimate hookup … no you want your bike to look cooler!!

No, I'm not that good.

Yes it would look good, and most definately paying a tenner for a tyre is a good thing

Originally Posted by yorkie_chris

No, I'm not that good.

Yes it would look good, and most definately paying a tenner for a tyre is a good thing

Cool, if you can get them for a tenner, then get me some too, I don't mind sticking them on the stock SV rim

That is unless they are Michelins ... please don't tell me they are Michelins ... what are they?

[jambo]

Apples should not be compared to oranges. By the time you've fitted GSXR forks & wheels, possibly a 120/70 tyre, jack-up plates, possibly an aftermarket shock and a wider rim with a 180 tyre your geometry has been affected by way more things than the tyre size.

On my ZX6R I have run a 170/60 R17 and a 180/55 R17 tyre (both are recommended fitment for that rim). Nothing else has been changed. I found when moving the bike through turns with the 180 rear it seemed *slightly* slower to change direction at the back. The trade off should be more rubber in contact with the road at big lean angles, but I'm not honestly that aggressive so had no complaints from the 170.

It's not going to make the bike brilliant or rubbish, but it will make it different, and going from a 160 to a 180 is likely to make the bike feel less nimble. Personally I wouldn't bother.

Jambo