I have always been told to leave a inch for tire expansion.

 

Wow, an inch eh? I was thinking the thickness of a chain (more like 1/2") but maybe I'll need to re-think...

 

Bro, i roll the same tire at 70hpr she will rise an rub the hell out of
my inside fender bolt....i took the wheel off flipped the bolt....problem
solved. Now i can ride like a bat out of hell

 

I have had this set up about a year and have had no problems at 55-60. I don't ride a lot of gravel roads ( could be a problem). No scrapes or rubbing on the tire what so ever . I run 30 lbs.Sorry I can't get photobucket to download smaller pics , what do I need to do?

 

We set up the Brown Sugar" bike with the same tire and a 1/2" clearance on the fender then put it on the dyno and took it up to 90MPh I stood there with my face all inside the wheel to see if it was going to clear the fender all that was good, but man

that chain sure move around a bunch.
the bad news now the customer has 500 miles on the bike and he hates those tires so bad out on the freeway we are taking them off and putting 2 new Dunlops K70's on. anybody want some Firestones?

 

anybody want some Firestones?

what size are they?

 

My buddy has about 5/8" clearance on his 16" firestone rear, maybe minus 1/8" for his p-pad nuts sticking though. Does fine untill about 100. We were doing about 120 last night and his rear tire had smoke billowing off it from expanding into the p-pad nuts.

 

My buddy has about 5/8" clearance on his 16" firestone rear, maybe minus 1/8" for his p-pad nuts sticking though. Does fine untill about 100. We were doing about 120 last night and his rear tire had smoke billowing off it from expanding into the p-pad nuts.

Sweet!

 

If you run tight clearance, just never let it get low on air.....then itll grow a lot ast speeds. I found out the hard way.

 

Cool. Thanks for all the input. I think I'll stick to the chain method (1/2").

 

Bozi is dead on here. The four things to consider: tire pressure (less pressure = more growth); rim width (narrower rim allows more growth); temperature (air temp and tire temp - hotter road surface+higher speed+low tire pressure= much heat and expansion, both from air temp inside the tire and softening of the tire compound); and fender mounting. For that last one, what I mean is if you do the usual "lay a chain on the tire and lay the fender on that for clearance" routine, that's great IF there aren't any tighter spots elsewhere, like any nuts/bolts or even the shape of the fender creating tighter spots. To be really safe (including those spontanious high speed blasts that seem to happen occasionally and usually when you least desire attention from the law), I'd leave 5/8" MINIMUM at the closest point between the tire and whatever (fender, bolt, etc). May not look quite as cool, but it's hard to look cool when you're pavement surfing 'cause your tire blew out...

-Kuda (not really a grandmother, honest)
'49 panchop

 

1/2 inch is excellent advise on rigid apps.

 

That Triumph is awesome!!