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missmatched tyres

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chillpill
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PostPosted: 17:43 - 08 May 2009    Post subject: missmatched tyres Reply with quote

any reason why this is a bad idea ? cheers
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MarJay
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PostPosted: 18:21 - 08 May 2009    Post subject: Re: missmatched tyres Reply with quote

chillpill wrote:
any reason why this is a bad idea ? cheers


Because different tyre models and makes have different tyre profiles which means you could have a very soft gentle round profile on the rear, and a super sharp pointy profile on the front which will totally screw up your handling.

I've had a few bikes which have had mismatched tyres (when I bought them) and it hasn't really been an issue, but I wouldn't push my luck for the sake of a few quid if I was going to buy one tyre anyway.
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SlimRick
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PostPosted: 19:41 - 08 May 2009    Post subject: Reply with quote

Different levels of grip front and rear can never be a good thing.
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Wozza
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PostPosted: 22:02 - 08 May 2009    Post subject: Reply with quote

SlimRick wrote:
Different levels of grip front and rear can never be a good thing.


Why?
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Paulington
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PostPosted: 22:12 - 08 May 2009    Post subject: Reply with quote

Wozza wrote:
SlimRick wrote:
Different levels of grip front and rear can never be a good thing.


Why?

If you have more front end grip, then when you lean to take a corner, your front end will grip more than the back, which means if you turn sharp enough your front tyre will still grip while your back doesn't leading to a high/lowside.
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Kickstart
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PostPosted: 22:22 - 08 May 2009    Post subject: Reply with quote

Paulington wrote:

If you have more front end grip, then when you lean to take a corner, your front end will grip more than the back, which means if you turn sharp enough your front tyre will still grip while your back doesn't leading to a high/lowside.


You stand some chance of catching it when the rear slides. You stand pretty much zero chance of catching it if the front goes. Hence having the rear slide first tends to be safer.

All the best

Keith
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Paulington
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PostPosted: 22:25 - 08 May 2009    Post subject: Reply with quote

Kickstart wrote:
Paulington wrote:

If you have more front end grip, then when you lean to take a corner, your front end will grip more than the back, which means if you turn sharp enough your front tyre will still grip while your back doesn't leading to a high/lowside.


You stand some chance of catching it when the rear slides. You stand pretty much zero chance of catching it if the front goes. Hence having the rear slide first tends to be safer.

All the best

Keith

Yeah, and obviously the reverse will happen if you have more rear end grip, like having a Diablo Corsa on the back and a plastic tire on the front.
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KevTM
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PostPosted: 22:30 - 08 May 2009    Post subject: Reply with quote

I think this is more complex than, at least I, understand.

My thinking is that even with matched tyres the front & rear will have different grip levels at any given time, different loads on each tyre, etc etc.. Have you even lost both tyres at the same time? It's usually one or/then the other.

Perhaps that's why different tyres seem to work better on different bikes and/or for different riding styles?

To be honest I can't see there being much of a problem as long as you're not running completely different compounds, for instance, a hard/touring rear and a super soft front or something.

I could be completely wrong but surely there's some sense in there Laughing
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Wozza
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PostPosted: 23:09 - 08 May 2009    Post subject: Reply with quote

KeV6 wrote:

My thinking is that even with matched tyres the front & rear will have different grip levels at any given time, different loads on each tyre, etc etc.. Have you even lost both tyres at the same time? It's usually one or/then the other.

To be honest I can't see there being much of a problem as long as you're not running completely different compounds, for instance, a hard/touring rear and a super soft front or something.


Pretty much what I was thinking.

Having a softer front tyre won't make the rear tyre have any less grip than normal, that's just daft. If you've got a crappy plastic tyre on the back, it's gonna slip no matter what you've got on the front.

I know of people who purposefully mismatch tyres to get a better lifespan out of the rear by sacrificing a little bit of grip, but keeping a softer tyre on the front.
For example:
Bridgestone BT-090 front, BT-92 rear.
Or Michelin Pilot Power front, Pilot Road 2 rear.

I wouldn't want to mismatch any old tyres, but thought-out mismatching is not uncommon.
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Paulington
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PostPosted: 23:55 - 08 May 2009    Post subject: Reply with quote

Wozza wrote:
Having a softer front tyre won't make the rear tyre have any less grip than normal, that's just daft. If you've got a crappy plastic tyre on the back, it's gonna slip no matter what you've got on the front.

I didn't say it would, I said the front would have more grip, and therefore while it would still grip comfortably, the back tyre if it is a bit harder will slide on heavy cornering. It'd only be noticeable if you were pushing it though.

However, to keep the thread going in the intended direction..

My bike, going to lean into a corner it feels as if it doesn't want to lean, and when it does lean it feels as if the front end is going to drop away.

Any clues?
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Eddie Hitler
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PostPosted: 23:58 - 08 May 2009    Post subject: Reply with quote

Quote:
Any clues?


Yea, you ride a shitty bike and think you know everything about motorbikes.
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Paulington
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PostPosted: 00:02 - 09 May 2009    Post subject: Reply with quote

Eddie Hitler wrote:
Quote:
Any clues?


Yea, you ride a shitty bike and think you know everything about motorbikes.

Thanks. Laughing.

If I thought I knew everything, I don't think I'd be asking a question about my bike now would I? Thumbs Up.
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"Four wheels move the body, two wheels move the soul."
Current Vehicles: '89 Kawasaki KDX200, '99 Yamaha XV535, '00 Honda ST1100 Pan-European, '08 Suzuki GSX-R1000, '08 Mitsubishi Lancer GS4 2.0 TDCi, '15 BMW 1 Series 116d Sport Turbo.
CBT: 27/08/08. Theory: 04/09/09. Module 1: 16/09/09. Module 2: 01/10/09.
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Eddie Hitler
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PostPosted: 00:03 - 09 May 2009    Post subject: Reply with quote

Paulington wrote:


If I thought I knew everything, I don't think I'd be asking a question about my bike now would I? Thumbs Up.


Current Bike: Aprilia RS50 '06.
Top speed: 75 mph
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Paulington
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PostPosted: 00:06 - 09 May 2009    Post subject: Reply with quote

Eddie Hitler wrote:
Paulington wrote:


If I thought I knew everything, I don't think I'd be asking a question about my bike now would I? Thumbs Up.


Current Bike: Aprilia RS50 '06.
Top speed: 75 mph

Haha don't start this again, it happens in every thread I post in.

If you want to bemoan and berate about it then do so in a PM rather than ruin a thread. Rolling Eyes.
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CBT: 27/08/08. Theory: 04/09/09. Module 1: 16/09/09. Module 2: 01/10/09.
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Eddie Hitler
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PostPosted: 00:18 - 09 May 2009    Post subject: Reply with quote

What do you expect.
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lukamon
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PostPosted: 00:18 - 09 May 2009    Post subject: Reply with quote

hes got a point though. 75mph? my c90 does 60mph Rolling Eyes
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Ben.
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PostPosted: 00:36 - 09 May 2009    Post subject: Reply with quote

depends what your mixing...
ive got a 2ct rear and a diablo corsa front, both got more than enough grip to get rid of any chicken stips, both heat up at about the same pace, and neithier will overheat on the road, so its fine. However i had a shitty michilin rear before i got the 2ct and that would over heat, and suddenly let go mid corner, the front would stay planted but the rear would slip, if your going to mix, allways get a grippier front, or get tyres that are of similar grip that you know you cant over heat...
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Paulington
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PostPosted: 00:39 - 09 May 2009    Post subject: Reply with quote

Malossi kitted RSes can do 100+ but only for about 15 minutes, mine is a reported 50cc cylinder, custom pipe, new carb and airbox + slipstreaming behind my Dad's bike.

Blah blah whatever, if you doubt it fair enough but if you want to debate it don't 'jack a thread to do it.
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"Four wheels move the body, two wheels move the soul."
Current Vehicles: '89 Kawasaki KDX200, '99 Yamaha XV535, '00 Honda ST1100 Pan-European, '08 Suzuki GSX-R1000, '08 Mitsubishi Lancer GS4 2.0 TDCi, '15 BMW 1 Series 116d Sport Turbo.
CBT: 27/08/08. Theory: 04/09/09. Module 1: 16/09/09. Module 2: 01/10/09.
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Ben.
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PostPosted: 00:44 - 09 May 2009    Post subject: Reply with quote

Paulington wrote:
Malossi kitted RSes can do 100+ but only for about 15 minutes, mine is a reported 50cc cylinder, custom pipe, new carb and airbox + slipstreaming behind my Dad's bike.

Blah blah whatever, if you doubt it fair enough but if you want to debate it don't 'jack a thread to do it.


just ignore them, you look like just as much as a tit as them when you reply to them...
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Eddie Hitler
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PostPosted: 00:50 - 09 May 2009    Post subject: Reply with quote

half_lyfe wrote:

just ignore them, you look like just as much as a tit as them when you reply to them...


Bets on how long you take to reply to this then. Mr. Green
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keyser soze
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PostPosted: 01:14 - 09 May 2009    Post subject: Reply with quote

I think it all depends on what your riding where and and how.

for me, I ride a supermoto and I like the most grip I can at the front and less at the back. its great when riding normaly but when I get going its brilliant fun sliding the back
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iooi
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PostPosted: 08:45 - 09 May 2009    Post subject: Reply with quote

Paulington wrote:
If you have more front end grip, then when you lean to take a corner, your front end will grip more than the back, which means if you turn sharp enough your front tyre will still grip while your back doesn't leading to a high/lowside.


I point you to a Moto Gp bike where they tend to drift the rear round the corners......
Its all about rider control and knowing just what the limits are.

The biggest No No's are cross ply and radial mix's
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garth
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PostPosted: 10:10 - 09 May 2009    Post subject: Reply with quote

I like having a crap tyre on the back, it's fun Mr. Green
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Kickstart
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PostPosted: 18:29 - 09 May 2009    Post subject: Reply with quote

Hi

I would say that grip and handling are 2 different things. Sometimes you land up with both.

Sometimes (most of the time I would say) mixing different tyres wil be fine in normal use. Riding at the very limit probably not perfect, but then very few have the ability to really ride at that limit.

As to your handling issue with the RS50, first thing I would say to check would be the tyre pressures. Tyre wear can also have odd effects. A worn front tyre can often give the same handling as a front tyre that is low on pressure (ie, when you start to lean the bars want to turn into the corner).

All the best

Keith
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Joeb46
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PostPosted: 22:24 - 10 May 2009    Post subject: Reply with quote

i have odd tyres and i still managed to get my knee down today, not big or clever on a drz Neutral but never mind, something to tick off the list Mr. Green
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