Wildguzzi.com
General Category => General Discussion => Topic started by: Moto Fugazzi on August 18, 2016, 10:46:07 PM
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My 2009 V7C feels twitchy at higher speeds with the stock tire (100/90-18 Pirelli Sport Demons), and I'm contemplating changing to a 110/80-18. Any ideas on what the results may be if I change to this size?
Suspension has been modified and set up properly with Mupo front fork cartridge emulators and YSS rear shocks.
Ken
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Interesting question . Not sure that a 10 MM increase in tire width will make the bike more stable . The effective tire sidewall height will be the same , so no change there . Have you checked the neck bearing adjustment ?
Dusty
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Interesting question . Not sure that a 10 MM increase in tire width will make the bike more stable . The effective tire sidewall height will be the same , so no change there . Have you checked the neck bearing adjustment ?
Dusty
Excellent question in response to my interesting question. I did check the bearing adjustment, and all seems to be good. There also doesn't appear to be any freeplay in the neck bearings, but I'm also not 100% sure I'm adjusting and checking things properly.
Keep in mind that I'm comparing this to my 2004 V11 Sport which is rock solid at high speeds. I ride the V7 so infrequently that I don't remember how it should ride from the factory...maybe this is normal for this small framed lightweight bike?
Ken
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Excellent question in response to my interesting question. I did check the bearing adjustment, and all seems to be good. There also doesn't appear to be any freeplay in the neck bearings, but I'm also not 100% sure I'm adjusting and checking things properly.
Keep in mind that I'm comparing this to my 2004 V11 Sport which is rock solid at high speeds. I ride the V7 so infrequently that I don't remember how it should ride from the factory...maybe this is normal for this small framed lightweight bike?
Ken
Sterling response to my ... Oh shoot , we are sounding like those two chipmunks that couldn't resist being overly polite and complimentary to each other :laugh:
Making a comparison between a V11 Sport and a V7 might be unfair . Still , maybe try leaning over the bars at speed to see if it helps . Seems the V7's can benefit from a bit more weight on the front . Good luck Ken .
Dusty
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Anybody else have comments, suggestions?
Steering head doesn't feel notchy or have excess free play, so I think the bearings are good.
Ken
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I found a cool website that calculates the differences in tires. I really shouldn't notice a difference at all.
Ken
https://www.tacomaworld.com/tirecalc?tires=110-80r18-100-90r18
(http://i286.photobucket.com/albums/ll83/ksiegel7/Misc/Screen%20Shot%202016-08-20%20at%2012.10.36%20PM_zps282rs3a3.png) (http://s286.photobucket.com/user/ksiegel7/media/Misc/Screen%20Shot%202016-08-20%20at%2012.10.36%20PM_zps282rs3a3.png.html)
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Sorry Ken , still just me . There has been lots of discussion about raising the forks to deal with this problem . A few months ago , I ran some figures past a professor buddy , math shows that the difference in feel comes from a change in weight distribution and not fork angle . Try raising the forks 10 MM .
Dusty