centrifugal force

[gee]

was thinking about those tyre valve caps that indicate by changing colour, if yout tyres are correctly inflated or not, but when speaking to a tyre fitter, he said they are a no no,because the centrifugal force from the wheel rotation, at high speed, causes the valve cap too increase in weight and puts undue stress onto the valve/tube! is he right or not??? g0551p

 

[stan the man]

not sure about those type,but tyre flies apparently do...but they're quite large/heavy.i know of one or two peeps that use them with no probs.

i'm sure someone more knowledgeable will be along soon.

 

[R2B2]

I remember there being some probs with tyreflies as well - I think it was Biker Babe (Tracy) who had a valve failure because of them. She posted a warning I'm sure.

I also heard something about those angled valve extensions too. I think the theory was the centifugal force caused the the whole thing to bend down towards the rim centre resulting in the rubber valve stem cracking, or leaking air from under the seal :dunno:

Something not nice anyway.

 

[Shalershasker]

I've just put them on my BB, not relying on them but they do seem to give quite a good indecation as to pressure so far, still check the pressures before i go out more out of habbit than a fear of them being inaccurate. Will keep an eye on them and if anything seems a miss or i have any probs at all i'll let you all know so you can avoid them like the plague.

 

[Pugwash]

Only problem I had with them was local scumbag kids nicking them. They even nicked the bloody ?2 red aluminium caps I used afterwards!

 

[Stuey]

It seems that the extra weight of the indicator caps will cause the rubber valve stems to continually bend due to the centrifugal force, and I think this has possibly caused one or two stems to fail in the past.
if you want to use the indicator caps, fit steel valve stems and you'll be fine. The indicator caps are good for that quick visual check when your touring and so on, but you still need to check them manually.

I've used them for a couple of years now with no problem until this morning. I went out to find a flat rear, and after pumping it up and still not finding a leak I re-fitted the indicator cap to find IT was leaking loads of air.

Stu

 

[Duck n Dive]

Once read somewhere not to bother with fancy valve covers as they can corrode... then yer buggerred.....???

 

[ianrobbo1]

got stainless air valves on mine, not been a problem and if I wanted to stick "tyre flies" or some-such on them it still wont be a problem!! as with everything else if you don't maintain it it will corrode and turn to shit!! :dunno:

 

[ianrobbo1]

runs now Lumps!! just has no exhaust, fairing, wheels,dash,brakes,brake lines,seat unit and tank, apart from that it goes a bomb!! :}

 

[RHINO]

just has no exhaust, fairing, wheels,dash,brakes,brake lines,seat unit and tank, apart from that it goes a bomb!! :}

And its still heavier than mine :B :B :B I want her back!

 

[ianrobbo1]

And its still heavier than mine :B :B :B I want her back!

gotta say it John, told you so!! :dunno: roll on march eh?? :dunno:

 

[Jaws]

The old original ones were indeed on the heavy side, but that was over two years ago now,, the new ones are just about the same weight as the standard ally ones..
Gee, you man was spot on but a tad out of date !
Methinks he should keep up with whats what ! LOL !!