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H: Hubs, Wheels and Tyres Are tyre clamps necessary?


kerry

Active Website User
VOC Member
On a black shadow I am fitting new Avon tyres, are tyre clamps needed. ? I wonder because I am told tyre pressures are supposed to be higher with today's modern rubber, ideally at least 28psi front and 32 rear, ? advice please.
 

ClassicBiker

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VOC Member
I'm running Avon AM26s front and rear. I run them at approximately the pressures you quoted. I look at this way if the pressure drops on a tubeless tire on a tubeless rim and the tire creeps round a little, no biggee. If the pressure drops and the tire creeps on a tubed rim, biggee. They were put there for a reason when tire creep was a possibility. Though it might no be probable it is still possible. I know they are a pain, but it doesn't hurt to have them there. I have them on the Shadow, the Comet, the '66 Trophy, '72 Daytona. If it has a tube it has a clamp.
Steven
 

Robert Watson

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VOC Member
Newer tire rubber (softer) and higher inflation pressures. I have never put the rim locks in on either 300 - 20 speedmaster or the old style 19 in rears, or any of the newer (roadrider/runner) tires, and despite some abuse, never spun a tire on the rim. As I mostly ride with a pillion passenger and often with luggage, I do run higher pressures than that.
 

stu spalding

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VOC Member
Hi Kerry,
Over the last 40 years I've fitted various Roadrunners and Roadriders, also Continental Supertwin and Blitz, and Bridgestone Battlax and didn't use security bolts with any of them, although this was on ally rims which have grips on the bead. Pressures? I usually run 32 psi front and 34/36 rear depending on load. Cheers, Stu.
 

A_HRD

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VOC Member
I can't remember the last time I used tyre clamps; it was a loooong time ago!
Peter B
 

ClassicBiker

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VOC Member
Well it seems I'm in the minority here. So let me ask these questions. Do your rims have the hole drilled for the rim lock or not? I don't think I would like to leave even the smallest area of the inner tube, excepting the filler, exposed. If the rim is drilled did you do something to prevent a foreign object entering through the hole?
Steven
 

Gary Gittleson

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VOC Member
I don't use rim locks. I do run the nut on the tube filler neck up toward the valve end and hand tighten it to the cap. That way, if there is any tire creep, the neck will become slanted and signal a problem. As others have said, with new rubber and higher pressures, it just doesn't seem to happen. I think rim locks still have a place on dirt bikes, but that's another story.

ClassicBiker is right that if the rim has a hole, it should somehow be covered. And that cover had better not have anything sharp on the inside. It had also better be very secure, so as not to pinch the tube.

Gary
 

vibrac

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VOC Member
I use rim locks BUT only on my trail bikes. On a long distance trial after the first section I run them as low as I dare without risking an Ello Ello Ello poping up. In that state I run a hundred miles at max speed 40 but mostly lower I have never seen a slippage on the rim and the only blow out I had was when I fitted a MX heavy duty inner tube , go figure!
I dont think its necessary on a road bike but if there was a rapid deflation you might be pleased you had......
 

Robert Watson

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VOC Member
I have also run no locks on rims with the holes. The rim tape gets an extra layer underneath where it passes over the hole. Like Gary in the second post above, locknut on the valve stem up against the cap. Only time I have had one move is when rolling out of winter storage with a flat tire and watching the stem kick off at an angle. An easy reset and go get the air bottle.
 

Bill Thomas

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VOC Member
I use them on rear steel rims, But my front wheels are alloy with the anti slip insides,
Maybe with a Comet and 300 20 front not, And I like lower tyre pressures.
 

kerry

Active Website User
VOC Member
Wow, so many helpful replies, I have decided to go for 30 psi front and 34 rear with solo riding, the Avon I just took off was 30 years old but unused for most of this period in a controlled temperature store and was almost in perfect still soft condition but who would chance using such old tyres, not me. I will not fit clamps though, I can accept both sides of opinions and as I say again I am grateful for such nice polite advice. Regards to all, Kerry
 

Bill Thomas

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VOC Member
I have a tyre on the front of my Special, And it won't wear out !,, But I don't go far!.
Just make sure you have an Hydraulic steering damper.
 

Comet Rider

Well Known and Active Website User
VOC Member
Kerry,
A little drag racing trick you could do, is to put a tip-ex line from the tyre onto the rim, any creep will show as the lines will no longer line up.
My dad did this on the rear of his Comet outfit, and nothing moved in 15 years

HTH
Neil
 

van drenth

Well Known and Active Website User
VOC Member
On a black shadow I am fitting new Avon tyres, are tyre clamps needed. ? I wonder because I am told tyre pressures are supposed to be higher with today's modern rubber, ideally at least 28psi front and 32 rear, ? advice please.

I left them out years ago, BTW, I use Bridgestone tyers.

van Drenth JC
 

Bill Thomas

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VOC Member
Just looked at my New Comet, And found I had not used a bolt in the rear !!, They are 1950 wheels and there was no hole !, But I doubt it will ever go :) .
 

Vincent Brake

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VOC Member
When i do a new tyre i always clean of the assembly "grease" very well before inflating.

I guess its down to the very soft sticky rubber, as the modern tyres are also used as tubeless.

Had one or two flats when at 70 mls/H.
But doubt if they would do any good.
 

Glenliman

Well Known and Active Website User
VOC Member
Robert suggested that I should remove the rear wheel tire clamp from my Rapide way back when. He said they make balancing a chore and are a pain when changing tires.
I agreed and promptly removed the clamp.
First ride afterward, second start-off, the wheel spun inside the tire, valve stem ripped off, instant flat!
But it was a hard,ancient, slippery square Avon Safety Mileage.
Switched to soft new Avons and have had no issues since, many years and thousands of miles. By now the bike must have done a couple of thousand start offs without the clamp, often loaded two up.

So if you want to run hard old tires, maybe keep the tire clamp.
Otherwise the clamp isn't needed!
Glen
 
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