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Wheel height and width affect handling?

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So I've heard that wheel size, both height and width have an affect on handling.

So if I go from an 18" rear wheel to a 19" rear wheel, what happens? I heard it makes the bike more stable, but is there a trade off?

My bike handles amazingly and is incredibly nibble, and I'm curious as to how big of a difference switching to a 19" will make.

The bike is a 2011 Ktm 150xc.

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A 19'' tyre will have less side wall flex but leaves the rim open to more damage than an 18'' wheel. 18'' tyres have a higher sidewall. Both wheels are about the same overrall size with the tyre fitted.

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The 19" wheel allows the bike to rev faster. That is why MX bikes went to the 19" rear to begin with. Conversely, the 18" wheel adds a little more flywheel effect.

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