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Widest tires on a Trailblazer #698280
06/12/17 11:41 pm
06/12/17 11:41 pm
Joined: Feb 2007
Posts: 1,149
Trenton, New Jersey
royaloilfield Offline OP
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royaloilfield  Offline OP
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Joined: Feb 2007
Posts: 1,149
Trenton, New Jersey
What is the widest tire that can fit on a trailblazer short swingarm? I just bought the suggested 4.00 dunlop, but it looks too small with the big valanced fenders. I have a 120 shinko on the rear, but it fouls the chainguard!!! Any suggestions??? thanks BRian


Brian
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Re: Widest tires on a Trailblazer [Re: royaloilfield] #698458
06/14/17 3:10 pm
06/14/17 3:10 pm
Joined: Jun 2002
Posts: 9,792
Scotland
S
Stuart Offline
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Stuart  Offline
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S
Joined: Jun 2002
Posts: 9,792
Scotland
Hi Brian,

Originally Posted by royaloilfield
4.00 dunlop,
120 shinko

'Fraid these are about as useful as a chocolate fireguard. frown Which "4.00 dunlop"? K70? Which "120 shinko" - 120/90x18?

Regards,

Re: Widest tires on a Trailblazer [Re: royaloilfield] #698488
06/14/17 8:37 pm
06/14/17 8:37 pm
Joined: Feb 2007
Posts: 1,149
Trenton, New Jersey
royaloilfield Offline OP
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royaloilfield  Offline OP
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Joined: Feb 2007
Posts: 1,149
Trenton, New Jersey
Yes..a k70..4.00 is what the Indian manual calls for. The shinko is 120/90x18 and just fits with chaingaurd off. Brian...just wondering what everyone else is using. Thanks brian


Brian
Re: Widest tires on a Trailblazer [Re: royaloilfield] #698670
06/16/17 9:26 am
06/16/17 9:26 am
Joined: Jun 2002
Posts: 9,792
Scotland
S
Stuart Offline
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Stuart  Offline
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S
Joined: Jun 2002
Posts: 9,792
Scotland
Hi Brian,

Risking telling you something you know already, the "4.00" and "120" are 'section widths', not overall widths. And, perhaps curiously,the same 'section width' from a different tyre maker can be wider or narrower overall (but not by much).

The 4.00x18 K70 is 4.17" wide overall. Otoh, 4.00x18 tyres in modern designs like the Avon Roadrider, Bridgestone Battleax, etc. are around 1/2" wider (e.g. the Roadrider is 4.6" wide overall). However assuming the Shinko 120/90x18 is the 230 Tourmaster(?), Shinko reckons that's 4.8" wide overall, so not a lot of difference.

Btw, one thing to bear in mind with 120-width tyres is makers don't usually recommend 'em on the old British rim widths. Trailblazer's rear rim is WM3? If so, that's equivalent to modern "2.15"; 120's are normally recommended on a 2.75-width (WM4.5 equivalent) rim and not narrower than 2.50 (WM4 equivalent).

Obviously, a 120-width tyre can be fitted physically on a WM3/2.15 rim but how the carcase bends varies between tyres from different makers - e.g. I know a 120/90x18 Roadrider enlarges the overall diameter! confused

Otoh, while a 2.50-width (WM4 equivalent) rim is normally recommended for a 4.00x18 tyre, minimum is 2.15 (WM3 equivalent). bigt

Hth.

Regards,

Re: Widest tires on a Trailblazer [Re: royaloilfield] #698824
06/17/17 5:24 pm
06/17/17 5:24 pm
Joined: Feb 2007
Posts: 1,149
Trenton, New Jersey
royaloilfield Offline OP
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royaloilfield  Offline OP
BritBike Forum member
Joined: Feb 2007
Posts: 1,149
Trenton, New Jersey
Stuart,
Thanks for the info! I decided just to put the K70 on and be done with it. TIme to get it on the road and put some miles down! Brian


Brian


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