sweetfa65
Expert Class
Posts: 110
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posted October 08, 2012 11:28 PM
 Edited By: sweetfa65 on 9 Oct 2012 07:37
Changing rear tyre profile from 55 to 50
Hi all.
I have a ZX14 fitted with Michillen Pilot Road II's in great condition. My fiancé', new to large bikes has just gotten her "big bike" license. She is now riding a 2007 ZX10R. A big difference from her GPX250, but she is a VERY sedate rider. Her tyres are pretty knackered in the centre, and I'm upgrading my bike to a more sports tyre and considering fitting my tires to her bike. My question is.... does anyone know exactly what effect changing from a 190/55/17 rear to a 190/50/17 would have? The front tire is the same profile (120/70/17), so won't be a problem.
Thanks for any help.
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'2013' SE Spark Black & Golden Blazed Green ZX14R. Bog stock after trading my 07 ZX14.
  
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Kneeburner
Expert Class
Posts: 102
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posted October 09, 2012 08:06 PM
Edited By: Kneeburner on 10 Oct 2012 04:07
It shouldn't make a huge difference in the way the bike handles it may slow the bikes steering a bit but probably not enough to notice..
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Speed is just a question of money how fast do you want to go
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sweetfa65
Expert Class
Posts: 110
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posted October 13, 2012 12:50 AM
Well changed the tyres today.
Given that the old tyres were very tragic, the swap has made an instant improvement.
I'll have to shadow her bike next ride and see if it makes a change to the speedo.
Thanks for the input.
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'2013' SE Spark Black & Golden Blazed Green ZX14R. Bog stock after trading my 07 ZX14.
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Davo10R
Parking Attendant
Posts: 10
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posted January 11, 2013 02:45 AM
The 50 series will not be as tall as the 55 so her bike won't steer as quick. The rear of the bike will sit a little lower. You can add some spring preload on the shock or add a couple of washers on top of the shock mount to regain what you lost. If you want to run a 50 series I recommend you go with a 200/50/17 as it is slightly taller than the 190/55/17 you won't have this problem. If you want to figure out the difference in hight of the tire... you multiply .50X190...or .55X190....this will give you the difference in MM.
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Dave sitra
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Davo10R
Parking Attendant
Posts: 10
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posted January 11, 2013 02:49 AM
The 50 series will not be as tall as the 55 so her bike won't steer as quick. The rear of the bike will sit a little lower. You can add some spring preload on the shock or add a couple of washers on top of the shock mount to regain what you lost. If you want to run a 50 series I recommend you go with a 200/50/17 as it is slightly taller than the 190/55/17 you won't have this problem. If you want to figure out the difference in hight of the tire... you multiply .50X190...or .55X190....this will give you the difference in MM.
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Dave sitra
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shiphteey
Needs a job
Posts: 2529
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posted March 19, 2013 12:16 PM
I'm gonna go get the papers get the papers.
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Gemini Motorcycles
Topping out everything from Ninja 250s to nitrous ZX-14s.
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TripleXZX
Parking Attendant
Living to ride
Posts: 28
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posted April 14, 2013 08:24 PM
Personally I've always changed to 190/50/17 and love the feel and haven't made any adjustments otherwise. Feels better to me. I do lots of long rides, quick lane changes feel smith as butter. I'd do it again on my next tire change.
TripleXZX
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2008 ZX-14 Special Edition
2008 ZX-10R
2000 ZX-12R
2001 Champions Edition R6
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SteveWFL
Moderator
Posts: 27920
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posted June 06, 2013 09:02 PM
55's will turn in much faster than the 50's. Anyone who disputes this either hasn't ridden on one, or if they have they're the straight line type of rider that might enjoy learning to drag a puck here:
http://www.motorcycle-usa.com/244/Motorcycles/Sportbike-Riding-Schools.aspx
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2010 Concours14
'08 R1 YAMAHA
ZX14 gone!
CBR600RR track bike
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