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hagafan
Joined: 21 Mar 2011 Posts: 3 Location: Cornwall
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Posted: Tue Mar 29, 2011 10:02 am Post subject: Car Tyres |
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I thought I had solved the problem of tyres by running a 6" bike wheel fore and aft with 190x40x17 car tyres fitted. But I read in this forum that bead seats are different. I have seen a trike that used a ZX9R bike to push it along and that seemed ok? can you machine the bead seat on the bike wheel to suit?
Can someone shed some light on this topic. |
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Gazza
Joined: 29 Jun 2010 Posts: 78 Location: Durham,England
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Posted: Tue Mar 29, 2011 11:34 am Post subject: |
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this topic comes up on the 'Britchopper' forum, but they are fitting bike tyres to car wheels, what i understand is, like you say the beads are different, whether there is enough material in a bike wheel to machine would be my concern, and that a car 17 inch tyre can be totally different in diameter to a bike 17 inch tyre,
maybe someone more informed might post a better reply |
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cudgel
Joined: 12 May 2009 Posts: 44 Location: Arcadia, Fl
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Posted: Tue Mar 29, 2011 11:45 am Post subject: |
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The simple answer is DON'T DO IT! It can be fatal. Car tires on car rims, bike tires on bike rims, no matter what anyone says and no matter how many Gold Wingers and others are doing it. |
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zentime
![](http://members.aol.com/subaguzzi/zen.gif)
Joined: 22 Jan 2005 Posts: 837 Location: Massachusetts USA
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Posted: Tue Mar 29, 2011 1:52 pm Post subject: |
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what Gazza and cudgel said 1000 times over regardless that people do it.
I don't have the exact #'s in front of me but besides the rim profiles being completely different, bead seat diameters are also different on car and motorcycle wheels. In the case of 17", the motorcycle rim diameter is significantly smaller than a car rim. So a car tire slips easily on to a motorcycle rim but it's wrong because the rim can move around on the bead seat. Basically the tire has to be over inflated to secure it to the rim but there is always the possibility of catastrophic failure. _________________ CBR1100XX/EZS
1973 MotoGuzzi V7sport
will August ever come............ |
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Dar
![](http://i211.photobucket.com/albums/bb83/darv11sport/Suzi.jpg)
Joined: 04 Mar 2006 Posts: 349 Location: Ballston Spa, NY
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Posted: Wed Mar 30, 2011 3:09 am Post subject: |
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zentime wrote: | what Gazza and cudgel said 1000 times over regardless that people do it.
I don't have the exact #'s in front of me but besides the rim profiles being completely different, bead seat diameters are also different on car and motorcycle wheels. In the case of 17", the motorcycle rim diameter is significantly smaller than a car rim. So a car tire slips easily on to a motorcycle rim but it's wrong because the rim can move around on the bead seat. Basically the tire has to be over inflated to secure it to the rim but there is always the possibility of catastrophic failure. |
Thanks for posting in English this time, Zen. I couldn't figure out what you were trying to say when you were posting in Azerbaijani ![Laughing](images/smiles/lol.gif) _________________ David D
Suzuki Bandit 1200/Hannigan Bandito
2000 Guzzi V11 Sport
2009 BMW R1200GS
1978 BMW R100RS |
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zentime
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Joined: 22 Jan 2005 Posts: 837 Location: Massachusetts USA
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Posted: Wed Apr 13, 2011 1:46 pm Post subject: |
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Taken from these specs, here are the diameter differences between car rims and motorcycle rims. The chart also shows the difference in profile for the standard car rim and motorcycle rim.
Wheel size 15" ________ 16"_________ 17"_________ 18"
car rim dia 14.968"______15.968"______17.189"______18.189"
mc rim dia 15.08"______15.978"______17.08"______18.08"
![](http://www.sidecaring.com/photos2/mc_rim.jpg) _________________ CBR1100XX/EZS
1973 MotoGuzzi V7sport
will August ever come............ |
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arbalest
Joined: 01 Feb 2005 Posts: 93 Location: Windham
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Posted: Wed Aug 22, 2012 12:11 am Post subject: car tires on motorcycle wheels |
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The current wisdom is don't do it. That said, Kosman Specialties has been machining the bead off motorcycle wheels and putting an automotive bead on, for years, for the drag racing crowd. They can also widen the wheel and/or change the offset. |
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