The wheel was rusted on. That happens all the time without correct servicing
Directional Tyres
- Thread starter securespark
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It wasn't particularly rusty, the car was nearly new. Problem was too good a fit between the hub raised section and the wheel. Enlarging the hole a little cured it.
Only if you selectively paraphrase to try and make a strawman point that wasn't actually made.
Like I said I don’t want to argue. I just tried to state a wheel nut is the key to keeping a wheel on.
It applies the pressure needed for the coefficient of friction.
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What are you talking about? I haven't joined the discussion about whether it's friction between wheel and hub, or bolt shear, which takes the load.
Yep. Have a look at pictures of most motorcycles with directional tread tyres. The front tyre is always fitted looking like it’s the ‘wrong' way round.
Yam R1 front and rear.
Rear wheels have to deal with acceleration force but the front wheel has to deal with braking force. They are usually labelled 'Front' and have an arrow marking the direction of rotation when going forward.
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Off-topic but,
despite the fact that bike is built for function, isn't it a thing of beauty
despite the fact that bike is built for function, isn't it a thing of beauty
Beauty is in the eye of the beholder. Mind you, half an hour on that and I’d need to see a chiropractor!Off-topic but,
despite the fact that bike is built for function, isn't it a thing of beauty
Assuming wheel studs are 7/16 UNF (maybe Asian cars are M12 these days) and grade 8.8 (might be higher grade, perhaps somebody on here knows), when tightened to the recommended torque, bolt load is 85% proof stress, and total load for typical 5 bolts is just under 20 tonne. I can post details if anybody’s interested. So even with a dynamic load of say 2 tonne/wheel and low coefficient of friction due to some grease, it’s OK.
On the other hand, if the nuts were slackened just enough so there’s zero compression between wheel and hub, the bolts loaded in shear can take the force, even taking account of allowable shear stress something like 60% of tensile.
So it’s OK whichever way you look at it.
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Until or unless the bolts have been overtightened and stretched at all of course
Anything can happen if they're abused enough. But even with substantial overtightening as discussed on here, the only problem is to the guy trying to remove the nuts.
I don't understand that. I get that the front will be applying resistance under braking rather than acceleration. But it will still be rolling forwards, so that directional tread will be squeezing water inwards instead of shedding it outwards which, to my mind, increases the risk of aquaplaning.
I think that front tyre is on backwards. Is there an official guide on this, or is this one of those things that people just do?
No, definitely not on backwards. That was my initial thought and I had never considered it until I bought and fitted a set of tyres on a bike I owned. I thought the front tyre had been marked up wrongly so I looked into it. Look at any pictures of a bike with directional tyre on the front. I think the fact that there is a radius on a m/c tyre instead of a flat contact area helps with water dispersal more than the read pattern.
The explanation I found suggests that the water within the treads has its own forward momentum. While the bike is slowing the water wants to carry on going ahead of the bike. So it shoots forwards within the treads, to the outer edges of the tyre.
That does actually make sense. But it still doesn't make sense when you're cruising and ride through a puddle. Then the water will be pumped into the centre of the tyre.
My suspicion is that it's largely all nonsense anyway. My non-directional car tyres have lines in each direction, and some dead ends. It doesn't jump in the air and fly off the road. It's just about having some grooves somewhere, the rest is largely marketing.
That does actually make sense. But it still doesn't make sense when you're cruising and ride through a puddle. Then the water will be pumped into the centre of the tyre.
My suspicion is that it's largely all nonsense anyway. My non-directional car tyres have lines in each direction, and some dead ends. It doesn't jump in the air and fly off the road. It's just about having some grooves somewhere, the rest is largely marketing.
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