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- SV Talk, Tuning & Tweaking (http://forums.sv650.org/forumdisplay.php?f=111)

- - Wider rear tyre? (http://forums.sv650.org/showthread.php?t=150971)

Re: is bigger better

Quote:

Originally Posted by yorkie_chris (Post 2259769)

He did not in fact say it was his tyre, thinking about it

Suffice to say the thing was pretty well melted, except for a small band,

I meant the bit about 1/10th off the lap record!

If you look at pretty much any of the miniwtinners running supercorsas, they'll all have small bands as it is pretty much impossible to use the whole width without crashing on an SV rim.

Re: Wider rear tyre?

What gets me more curious about SV is how it uses all front while leaving strip on back despite having really lazy geometry.

With much higher rear (actually longer than ohlins at full extension by 5mm or something like that) my chicken strips look more normal, using more of rear tyre and less of front. Counter-intuitive, though interesting.

I think those 160 SCs might be meant for a 5.0 rim and that's why, but I haven't tried fitting CBR rim to try it

Re: Wider rear tyre?

Just stick to the correct conclusion you came to in post 11!

Re: Wider rear tyre?

Quote:

Originally Posted by bald git (Post 2259733)

60 is aspect ratio or height of sidewall, surely these are same, its just width thats different.

It cannot be both.

It is in fact ratio, and 0.60 x 170 is smaller than 0.60 x 160 ... get a calculator and try it :)

Then measure some tyres and find numbers on sidewall have a fairly loose relationship with reality :-P

Re: is bigger better

Quote:

Originally Posted by BigBaddad (Post 2258883)

The Height of the profile i.e. in this case 60 is the % of the width. So 60% of 170mm is bigger than 60% of 160.

Fitting 170 tyre in place of a 160 would raise the height further as it is being pinched more.

In theory raising the rear of your bike can make it turn in quicker, but fitting a bigger would add more unsprung weight and increase the rotating mass (which is far greater than static mass), slowing turn in, will also need more energy the brake and accelerate.

In reality, you may not notice any difference. The sv runs well on a 160 so I wouldn't bother. As for your insurance, speak to them and at the least tell them about all the mods on your bike and make sure they put it on your policy schedule.

got most of that. extra mass increases gyroscopic force therefore the tyre will want to keep itself upright, so when turning, mass is forcing itself against the turn making steering slower. this can be counter acted on by decreasing angle of steering slightly, ie raising forks. its the pinching bit i dont get as both tyres have a recommended rim size of 4.5 inches.

Re: Wider rear tyre?

Quote:

Originally Posted by -Ralph- (Post 2259853)

Just stick to the correct conclusion you came to in post 11!

i will, its carried on more than i expected.