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Thick V Thin

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Louise
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Joined: 22 May 2006
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PostPosted: 03:11 - 08 Dec 2006    Post subject: Thick V Thin Reply with quote

Excuse the pun Wink
But just sitting here thinking, The bike I own at them moment (Cagiva 125cc ) Has a back wheel of a 400cc (?)

Im looking to change to a RS soon, which has a much slimmer back wheel.
My question is will I notice a mega difference because of the wheel size?
IE, If i were to go round a bend, Am I more likely to come off from a Slimer wheel to a thicker one?

Im only asking because, as stupid as it sounds, Ive not riden my push bike for months, first time today, riding it I felt like I couldnt go round corners like I used to, I had to slow right down because my back wheel just didnt feel right Confused
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yambabe
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Joined: 12 Jul 2004
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PostPosted: 03:17 - 08 Dec 2006    Post subject: Reply with quote

No. It will feel odd the first couple of times you ride it, and then you'll start getting used to it and making any adjustments you need to to be able to ride it properly.
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Dazbo666
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Joined: 06 Jun 2004
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PostPosted: 03:22 - 08 Dec 2006    Post subject: Reply with quote

+1 with babyyam

Yes the handling will feel a little different. Just take it easy and get used to the difference at your own pace.
Ride safe. Thumbs Up
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Whosthedaddy
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Joined: 11 Dec 2005
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PostPosted: 03:33 - 08 Dec 2006    Post subject: Re: Thick V Thin Reply with quote

Louise wrote:
Im only asking because, as stupid as it sounds, Ive not riden my push bike for months, first time today, riding it I felt like I couldnt go round corners like I used to, I had to slow right down because my back wheel just didnt feel right Confused


Im a little confused.

You start by talking about the cross section of a tyre on an an RS and then how strange the handling is on a push bike?

I recently rode a dodgy push bike at Centre Parks and almost crashed several times as I was still trying to corner with counter steering and was forgetting to turn the handle bars. Brick Wall Laughing

The rear wheel on the ZXR was nice fatty, and the FZR a little skinny one Sad After getting used to a squared rear wheel Rolling Eyes the FZR handled just as easy as the larger rubber on the ZXR. Although I'm sure that the geometriacl forces and C of G whilst cornering do affect the turning and handling charactoristics of motorcycles with different profiles, radius' and widths.

Eg

Although you can still get a knee down on a ped, its much harder and less stable than that of a modern sports due to the narrower tyres and smaller radius of the rear wheel.

https://homepages.nildram.co.uk/~siggi/kneedown/KneeDown1.jpg
https://homepages.nildram.co.uk/~siggi/kneedown/KneeDown2.jpg
https://homepages.nildram.co.uk/~siggi/kneedown/KneeDown3.jpg
https://homepages.nildram.co.uk/~siggi/kneedown/KneeDown4.jpg
https://homepages.nildram.co.uk/~siggi/kneedown/KneeDown5.jpg
https://homepages.nildram.co.uk/~siggi/kneedown/KneeDown6.jpg

Stolen from a Siggi post Shifty
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craigs23
Mr Muscle



Joined: 08 Jun 2005
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PostPosted: 09:56 - 08 Dec 2006    Post subject: Reply with quote

As mentioned, may take a little while to get used to.

Thicker tyres generally have a slower rate of turn, and are sometimes easier to get get leaned over (depending on the tyre profile (I think (or is that the reason why more rear tyre tends to get used as front at any given lean?)))
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Jack_Cheese
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Joined: 14 Jul 2005
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PostPosted: 17:44 - 08 Dec 2006    Post subject: Reply with quote

The cagiva's rear tyre is pinched onto a rim that's too small (on the mito and planet anyway, not sure about the SC). the handling is set up for it, but the general consesnsus is that the RS is a better handling bike. Anyway, aren't you riding a supercity, in which case the tyre size loses all relevance when you're going from a supermoto to a sportsbike?

Jack
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beatnck
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Joined: 29 May 2006
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PostPosted: 21:52 - 08 Dec 2006    Post subject: Reply with quote

as long as youve got decent rubber on the rs you wont struggle for lack of grip..unless its icy, or wet of course Laughing
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Mark312
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Joined: 13 Oct 2006
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PostPosted: 00:14 - 09 Dec 2006    Post subject: Reply with quote

Thanks, Whosthedaddy, thats interesting reading.... Wink
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Kickstart
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Joined: 04 Feb 2002
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PostPosted: 00:18 - 09 Dec 2006    Post subject: Re: Thick V Thin Reply with quote

Louise wrote:
Excuse the pun Wink
But just sitting here thinking, The bike I own at them moment (Cagiva 125cc ) Has a back wheel of a 400cc (?)

Im looking to change to a RS soon, which has a much slimmer back wheel.


Both the Supercity and the Aprilia RS125 use the same size back tyre.

Basic physics a larger contact patch alone does not increase friction. In practice there are loads of other factors so it does affect it, but you will get more difference between different brands of tyres.

All the best

Keith
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lilredmachine
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Joined: 24 Jan 2005
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PostPosted: 10:59 - 09 Dec 2006    Post subject: Reply with quote

I was gonna say, the difference between a supermoto and a sportsbike (particularly one as extreme as an RS in size and weight) is huge. The rear tyre will be the least of your worries.
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