Front tire size - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 21 (permalink) Old 12-06-2012, 07:16 PM Thread Starter
jrc
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Front tire size

Trying to find the right tire for a 79 bonneville. The manual says 4.10 x 19. It currently has a 3.25 x 19. Does any have any suggestions, a 110/90 would be a 4.0x19.

My perferance is the lasertrac by metzler but it does not come in a 4.1 x 19.
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post #2 of 21 (permalink) Old 12-07-2012, 03:56 PM
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Handling would probably be sharper with a 3.60 x 19 although a 4.10 was original fitment for that year.Smaller tyre equals less unsprung weight.
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post #3 of 21 (permalink) Old 12-07-2012, 08:11 PM
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The '79 T140E were originally fitted with Dunlop K81's in the size you're looking for. Dunlop still makes that tire in the sizes you need to duplicate the stock sizes. The K81's were the hot thing back then for handling.
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post #4 of 21 (permalink) Old 12-07-2012, 09:52 PM
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Are you matching the rear tire as well?
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post #5 of 21 (permalink) Old 12-08-2012, 08:58 AM
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I have the Lazertrac 3.25 on my bike, size looks good and performance is good. Im not running a front fender so I couldnt say how it looks with one.
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post #6 of 21 (permalink) Old 12-08-2012, 11:03 AM
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I have roadriders on mine

they're 90/90-19 F and 100/19 R

Last edited by DAVE M; 12-08-2012 at 11:07 AM.
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post #7 of 21 (permalink) Old 12-08-2012, 11:49 AM
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Thumbs up K81

Quote:
Originally Posted by ramengr View Post
The '79 T140E were originally fitted with Dunlop K81's in the size you're looking for. Dunlop still makes that tire in the sizes you need to duplicate the stock sizes. The K81's were the hot thing back then for handling.
That's true, it's the tire I run on my Commando. It looks period but more importantly works well too. The "new" K81 is made in Japan and if I may hazard a guess has a better (more modern) rubber compound than the original.
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post #8 of 21 (permalink) Old 12-08-2012, 08:44 PM Thread Starter
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Sounds like a laser trac 110/90 or the dunlops 4.10. Just need to decide on the orginal look or newer design tire.
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post #9 of 21 (permalink) Old 12-09-2012, 08:29 AM
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If your bike is mostly orginal I would go with the dunlops, Mine is set up as a cafe racer so the lasertracs were a better look.
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post #10 of 21 (permalink) Old 12-09-2012, 02:30 PM
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Hi, back in the old days when a couple of mates of mine raced t140,s
they fitted 3.60 front and 4.25 rear. they said the 3.60 on the front made the bike handle better.
This is sizes i used on both the commandos I owned the T150v and my wifes T140e( I changed the rear wheel rim size on the Trident and commando to 18").
The T140es I own now has a 4.10 on the front but it's brand new when it wears out I'll fit a 3.60 if I can find one.
I fit where possible TT100's if Malcolm uphill can lap the Isle of Man at 100mph on them, then it's good enough for me.
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