200/50 rear or not - Honda RC51 Forum : RC51 Motorcycle Forums
 
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post #1 of 7 (permalink) Old 08-16-2011, 04:56 AM Thread Starter
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Red face 200/50 rear or not

Brought a 200/50 Battleaxe Bt14 cheap by accident .Thought it a 190 .
Do they fit and what would I expect in the handling dept?
I've heard it will fall in faster and push out (understeer) on the acceleration .
Any one done this ?
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post #2 of 7 (permalink) Old 08-16-2011, 11:38 AM
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I doubt a 200/50-17 will improve anything on your bike.
The advantage of the 190/55 over a 190/50 (and probably a 200/50), is the cross-sectional profile of the tire.

Below is a comparison between typical 180/55-17, 190/5017, and 190/55-17 tires.
Note how the 180/55 and 190/55 are more pointed than the 190/50, which is rounder/flatter.
The 200/50 will be similar to the 190/50, but slightly taller and wider.

The more pointed curvature of the 180/55 and 190/55 is what helps the bike transition into turns. The added tire height also raised the rear of the bike and slightly decreases the rake and trail, also causing the bike to turn in quicker

The advantage the 190/55 has over the 180/55 are two-fold.
1) The 190/55 tire fits a 6" width rim while the 180 is designed for a 5.5" width rim.
To fit a 180/55 tire onto a 6" rim requires deforming the tire, which not only stresses the tire carcass, but tends to flatten the tire, defeating the purpose.
2) A 190/55 tire has a similar profile than a 180/55, but has additional sidewall area.

What a 200/50 tire will do is raise the rear of the bike slightly, but it will still have a flatter curvature. So the bike will likewise not want to roll into turns as easy as a 190/55.

While it may seem minor, the difference between a 190/50 and 190/55 can be dramatic.
But once you get used to it, I doubt you will want to go back to the 190/50.

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post #3 of 7 (permalink) Old 08-16-2011, 05:55 PM Thread Starter
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I have been told that to 'shoehorn' the 200 will raise the profile of the tyre in the width/height, creating more of a 'V' in the tyres shape .this apparently will cause the bike to fall in faster , but on the exit ,the extra width will cause it to push wide .
If this is the case then the bike should be about the same in the flickability department . It will ,so it seems theoretically give the capacity to drop into the corner alot later ,which should offset the exiting pushing wide .
With the modern bike , it's more about pointing it where it wants to go as early as possible and use its enormous acceleration ,hence the width of tyres have increased to cope with the load and to increase the contact patch.
Based on this , if the 200/50 does raise its height rather than remain flat as shown , this might actually suit the point and squirt characteristics of the modern bike .
It's either that or my exit speeds are going to be alot slower.
A fella on a TRX 850 put a YZF rear swingarm/rim on it and could fit a 180 tyre. THe TRTX uses a 160 rear tyre normally .He lost 3seconds a lap simply because the Trixie didn't have the power to exploit the nature of the tyre . It relied more on entry and corner speed more so than the exit speed . The bloke claimed the bike pushed too wide .
But this case is slightly different as the tyre is going onto a rim that it was not meant for , and hence the height is adjusted theoretically .
The stresses put on the tyre can be adjusted in the tyre pressure . On the basis the tyres unnatural profile will create a bigger loading on the structure ,it might mean I can run lower air psi , that allows for more traction .
Am I talking myself into saying I may not of stuffed up ?? LOL

Last edited by sandmacker; 08-16-2011 at 05:57 PM.
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post #4 of 7 (permalink) Old 08-16-2011, 07:45 PM
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Try and see if it suits you.
If not, then try a different tire. Experiment.
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post #5 of 7 (permalink) Old 08-17-2011, 06:04 AM Thread Starter
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Yeah , I'll do that . There's only one way to find out .Just thouht someone else may of tried it .
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post #6 of 7 (permalink) Old 08-17-2011, 01:55 PM
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I made the same order mistake - the 200 will fit and will be slightly noticeable in the turns. Will take a little more effort to get it heeled over but its not that bad. Obviously I went back to a 190.

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post #7 of 7 (permalink) Old 08-17-2011, 09:27 PM
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Never tried the 200-50, but I have a 200-60 on my track bike, fits with more than enough clearance, even for the tire warmers.
Last year ran the 190-60, liked it, I love the 200-60, can get on the gas that much sooner.
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