Tyre profiles ?? Title change for Supermaxx tyre help

[Blimey]

Me again

"Q" 1)Can someone tell me the effect of changing the front profile of my bike tyre ??

The trackbike this is, is running 120/70/17 front and 160/60/17 rear

I can buy a brand new pair for £110 but the front will be 120/60/17 will this make much difference to the handling please or is just not the right thing to do??

"Q" 2) Can someone tell me the effect of changing the rear from a 160 to a 180 also please??

There is so much more out there in a 180 range or again is this not the right thing to do??

Thank you xxxxxxxxx

[deej]

the slicks i bought off webber are a 60 front and cant say i noticed any different,im sure rich will say otherwise

160 to 180 should fit the run but may not fit the bike,you may find it catches the chain,hugger or swingarm. i think the 180 will give you a taller tyre giving more of a patch whilst cornering

[Johnnyb]

i think it means they will be a bit thinner as the second figure if i remember rightly in a tyre size ie 120/70/17 means that the depth of the tyre from the rim to the tread is 70% of the width (120) so a 120/60/17 is 10% less than that and so should be a little more rigid as less sidewall to flex, i think, but am happy to stand corrected

[TLS-Moose]

Not sure of the impact of the /60 profile on the front, other than many change to 70's purely for the extra choice.

160 to 180 is a big jump for the rear, but depends on the rim width - the 160 is probably only on a 4.5" rim, whereas a 180 requires a 5.5" rim. This will mean the tyre profile is deformed, affecting contact patch on ground and overall performance. You could see if a later CBR rear designed for the 180 will fit

[age]

I know when Phaseone had to go from a 125 front to a 130 front it made the bike harder to turn the fix for this is to raise the rear, as for the 70 profile to a 60 I cannot say.

As for the rear the jump from a 160 to a 180 is a big jump !

As Moose says the 180 on a 4.5" rim will cause you to have a smaller contact patch as the tyre will be deformed.

On the Ducati it's best to go from a 190 down to a 180, the 190 caused the bike to understeer making the bike run wide.

We run 200's on the race bike but on 6.25" rims how ever we used to run the 205 on 6" rims.

My advice Mark would be to stick to whats on it !

[TLS-Moose]

Rennsports in the right size ..... http://cgi.ebay.co.uk/120-70ZR17-160-60 ... m153.l1262

or better yet, scrubbed Supercorsas in the right size ... http://cgi.ebay.co.uk/Pirelli-Supercors ... m153.l1262

Have a good look in the last sellers shop, searching for 160* ...... some damned good deals there

[Blimey]

Rennsports in the right size ..... http://cgi.ebay.co.uk/120-70ZR17-160-60 ... m153.l1262

or better yet, scrubbed Supercorsas in the right size ... http://cgi.ebay.co.uk/Pirelli-Supercors ... m153.l1262

Have a good look in the last sellers shop, searching for 160* ...... some damned good deals there

Moosey you a gem. I did find the Rennsports one on E-Bay but the supercorsa's look great.

Whats that 2 or 3 times you have bailed me out Your a top bloke you know that

[Funky]

I know that if you increase the wall hight of the tyre (the smaller number) then the bike tends to be slower steering as it was with my R6 so decreasing the wall I assume will make it corner faster. If it seems too fast it might be an idea to raise the yoke up the suspension 5mm or so to compensate.

I think going up in width of tyre (the larger number) will have a similar effect on the handling, being slightly slower to steer in as you have a larger contact patch to roll around on. If this is the case I think you could raise the rear ride height to steer a bit faster again.

I could be wrong though!

[Dunno]

Lets start with the rear.

A 180 probably wont fit anyway and i wouldnt do it. Although it will give you a bigger contact patch it will slow the way the bike drops into a turn. Different tyre manufacturers use very different profiles pirelli and metzler use the same carcass and make a very stable tyre that grip very well and are fairly neutral feel wise. Dunlops are very pointed and turn quickly they feel great on full lean but can be a bit wobbly flat out upright. I haven't race on anything else so can't tell you about the others.

Changing the front size will do the same as the rear as the trye profile will be flatter. Stick with what you use now and try different tyre manufacturers and if it's grip the look at compounds. look at the side wall and you will see a number after a code sc1 /2/3 1 is softest 3 is hardest. use a 1 on the front and 2 or 3 on the rear.

Dunlop use millions of codes. Ask Layne for them but 555 is super soft 1 lap job ! 902 /758 and the new ones are different again. Go to North Glos website and ask people for partworns. http://www.ngroadracing.org soem of the guys use them for one day and the sell them off mega cheap.

It's all down to what you feel best on. I always got my ass kicked by an old man on a CBR6 that made a set of corsas last for 5 race meets and never used tyre warmers ! and Laynes not to slow on that old shed of a 750 using tyres he picks up from the scrap heap.

[Blimey]

My word Ian didn't realise you were so intelligent. Cheers for that mate and great to see you onboard

[deej]

My word Ian didn't realise you were so intelligent. Cheers for that mate and great to see you onboard

hes not,hes obviously copied and pasted it from another forum and changed the peoples names around
stick with the size you've got as thats what honda decided was best when they developed the bike

[TLS-Moose]

look at the side wall and you will see a number after a code sc1 /2/3 1 is softest 3 is hardest. use a 1 on the front and 2 or 3 on the rear.

Pirelli do an SC0 in the Supercorsa

Dunlop use millions of codes. Ask Layne for them but 555 is super soft 1 lap job ! 902 /758 and the new ones are different again.

For Dunlop Slicks, dunno if it's the same for treaded tyres:
from 2007
125/80R17 KR106
465 soft
950 soft-medium
758 medium-soft
237 medium
336 medium-hard

Race Slicks
Front
125/80R17 KR106 465 soft
6178 soft-medium
6136 medium-soft
6167 medium
125/80R420 KR106 465 soft
6178 soft-medium
6136 medium
6167 medium-hard
Rear
165/55R17 KR108 3166 soft-medium
6166 medium
3167 medium-hard
170/55R17 KR108 950 soft-medium
237 medium-hard
195/65R17 KR108 7490 soft-medium
7433 medium-soft
7503 medim
7511 medium-hard
200/70R420 KR108 7490 soft-medium NEW!
7433 medium-soft NEW!
7503 medium NEW!
7511 medium-hard NEW!

(these are the tyres used in 250cc world championship)

and Laynes not to slow on that old shed of a 750 using tyres he picks up from the scrap heap.

a) don't say things like that, it go's to his head (being so close to the ground, it's not got very far to go ) and b) just another example of his legendary "tightness"

[age]

Moosey you not bad for compounds mate.

We are on the Ntec's but we run the latest development ones.



fronts are

6136 or 6758 the 6137 is very close to the 237 just with a harder tyre wall and in a 130 and we call that a hard compound. The 6758 is the next generation but compund is very similar to the 758 and just about works every where.

there is no direction arrow on ours but has very small nubers on one side and that tells us which way round they go.

On the rear its the 6483 we tested 3 carcus's and they have made the tyre walls alot stiffer and they are 200's.



7433 medium-soft NEW!
7503 medium NEW!
7511 medium-hard NEW!

These are great tyres and the 7511 worked better when colder.

The rears have to be fitted onto rims which have a non slip coating on the rims and the tyre can only be fitted using a machine and can't be fitted with any tyre soap.

If you get offered the 7434 don't have it as it was a compound that just did not work anywhere and you will end up on your ass.

best compounds will be the 758 front and 7433/7503 rear

[thelastsuperpower]

This is something ive noticed with my new tyres...my old conti road attacks i got them about 5mm from the edge of the tyrewall.after having a pair of new maxxis supermaxx sports fitted ive been pushing my cornering way more...yet i have a good 10mm of unused tyre at the edge

Would this be down to a higher tread (old ones were squaaaared off),or a sportier profile?both tyres are 180 btw.

[deej]

what size 180 though, i mean are they a 180/50 or a 180/55.
different companys do make theyre tyres in a different way to each other so it could be the maxxis are more sports biased than the contis and may well have a higher centre profile