Change of rear tyre profile?

[DuraAce]

Bike runs 190/50 on the rear but I have a few free 190/55 tyres available to me.

Would it handle better or worse? Or should I just buy some tyres of the right size?

I know it'll affect the speedo reading a bit but it's for my track bike so not worried about that

[catso]

Should turn in quicker with the taller profile - a bit like a 180 but with more rubber on the road.

Can't imagine it causing any problem, unless it fouls something (hugger?)but it will make the bike sit a little higher at the rear so you might want to lower it to compensate?

[dan0h]

As said above, most common complaint is fouling the rear hugger, though there is also going to be potentially a tiny little bit less of a footprint when upright, so I'd be inclined to run it a pound or so softer on the road, just for compliance sake...

[gareth_r]

Theoretically, the radius will increase by about 9mm, so there is quite a difference as far as clearance is concerned.

[Wedg1e]

gareth_r said:

Theoretically, the radius will increase by about 9mm, so there is quite a difference as far as clearance is concerned.

You mean the diameter, surely?

[bass gt3]

Wedg1e said:

gareth_r said:

Theoretically, the radius will increase by about 9mm, so there is quite a difference as far as clearance is concerned.

You mean the diameter, surely?

tyre height will go from 95mm to 104.5mm nominal.
so the bike will sit 9 mm higher in the rear hence the possibility of fouling the hugger.
to compensate, maybe push the forks down a few mm to negate the effects.

[hebegb494]

bass gt3 said:

Wedg1e said:

gareth_r said:

Theoretically, the radius will increase by about 9mm, so there is quite a difference as far as clearance is concerned.

You mean the diameter, surely?

tyre height will go from 95mm to 104.5mm nominal.
so the bike will sit 9 mm higher in the rear hence the possibility of fouling the hugger.
to compensate, maybe push the forks down a few mm to negate the effects.

...all above (bassgt3) true...and height( rolling radius ) will then grow some more once it starts being used and has some power put into it, expanding the air in the tyre and making it "grow" ...if it sits really close to front of swing arm when static and unused cold, it will probably touch and rub once hot ...

[Biker's Nemesis]

hebegb494 said:

bass gt3 said:

Wedg1e said:

gareth_r said:

Theoretically, the radius will increase by about 9mm, so there is quite a difference as far as clearance is concerned.

You mean the diameter, surely?

tyre height will go from 95mm to 104.5mm nominal.
so the bike will sit 9 mm higher in the rear hence the possibility of fouling the hugger.
to compensate, maybe push the forks down a few mm to negate the effects.

...all above (bassgt3) true...and height( rolling radius ) will then grow some more once it starts being used and has some power put into it, expanding the air in the tyre and making it "grow" ...if it sits really close to front of swing arm when static and unused cold, it will probably touch and rub once hot ...

My Dunlop slick was just touching the bracing at Mugello on the start finish straight, no other than Luca Cadalora came into the garage to tell me.

[gareth_r]

Wedg1e said:

gareth_r said:

Theoretically, the radius will increase by about 9mm, so there is quite a difference as far as clearance is concerned.

You mean the diameter, surely?

No, I mean radius.

[Biker's Nemesis]

gareth_r said:

Wedg1e said:

gareth_r said:

Theoretically, the radius will increase by about 9mm, so there is quite a difference as far as clearance is concerned.

You mean the diameter, surely?

No, I meant radius.

Fight!!!!!!!!!!!!!!!!!!!! Punch his face in Gareth.

[gareth_r]

Biker's Nemesis said:

gareth_r said:

Wedg1e said:

gareth_r said:

Theoretically, the radius will increase by about 9mm, so there is quite a difference as far as clearance is concerned.

You mean the diameter, surely?

No, I meant radius.

Fight!!!!!!!!!!!!!!!!!!!! Punch his face in Gareth.

Certainly not, it's the season of goodwill to all men!

Anyway, I'm exhausted from all the complicated mathematics involved (in typing a few numbers into http://powerdog.com/tiresize.cgi).

[DuraAce]

Hmm nothing to lose by trying it I guess, I'll get one fitted and see what the swingarm and hugger clearance is like.

Reckon it'll handle much different? I'll probably not even notice as I'm crap and slow!

[Wedg1e]

gareth_r said:

o, I mean radius.

Doh, of course you do
Sorry, chap.

As you were

[Yazza54]

Slightly quicker turn in, that's about it. Remember a taller tyre will affect gearing slightly but you'll barely notice it, can also make your speedo overread depending what kinda speedo drive you have.

[itannum990]

Did this on my r1, felt waaay better. But of course the old tyres were knackered and square.

Seems to have more grip on the edge when you're lent over but again i changed brands.

This is no help to you at all.

[siamblue]

itannum990 said:

Did this on my r1, felt waaay better. But of course the old tyres were knackered and square.

Seems to have more grip on the edge when you're lent over but again i changed brands.

This is no help to you at all.

Thanks for that info,in the spring i am putting a 200 55 on my R1.

[bass gt3]

siamblue said:

itannum990 said:

Did this on my r1, felt waaay better. But of course the old tyres were knackered and square.

Seems to have more grip on the edge when you're lent over but again i changed brands.

This is no help to you at all.

Thanks for that info,in the spring i am putting a 200 55 on my R1.

just be careful if you're going from a 190/50 to a 200/55 as that's a 15mm profile increase nit including centrifugal growth. Measure the gap around the current tyre to make sure you have at least 20mm+ gap everywhere around the existing 190/50

[siamblue]

bass gt3 said:

just be careful if you're going from a 190/50 to a 200/55 as that's a 15mm profile increase nit including centrifugal growth. Measure the gap around the current tyre to make sure you have at least 20mm+ gap everywhere around the existing 190/50

Thanks Bass,i know of some other people that have fitted the 200/55 to their 5VY R1,there is lots of room around the swingarm and the hugger.

[monkeh]

You might find the bikes more unstable at high speeds and you get some headshake