F&R wheels spacers--why are they not magnetic?

As the above says,girlfriend asks me everytime i change the wheels and they fall on the floor--is thier any reason they can`t be magnetic?

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AKA  DNF-DALY

unless they were pretty potent they aren't going to be strong enough to stay in place, materials that make strong magnets generally don't have great material properties (IE, not very strong). Magnets also add significantly to the cost, and possbily first and foremost, you don't want magnets that have been in a workshop environment next to your bearings.

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...at least I got chicken.

Trust me, I'm an engineer

"you don't want magnets that have been in a workshop environment next to your bearings. "



Why would that be?

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AKA  DNF-DALY

Cos they'll likely have metal filings on them.

Captive wheelspacers - how's that work? Eventually I'll be needing to have new spacers made up for a fireblade 17" conversion, so would be handy if they could be made captive.

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I used to be BlessMyCG, long ago in a dark place.
Love, peace and unity!

Because they'll attract lots of bits of metal to stick to them, that'll make it difficult to get the spindle in and when you do you'll push the metal bits through the wheel scoring it.

You'll also force them next to the bearings which are covered in grease so they could transfer to the bearings ruining them.

crust

Araldite

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James May:
I’d like to declare the Honda Cub to be the greatest machine of all time;
Nay, the single most influential product of humankind’s creativity.

A_morti has it in one.

As for captive spacers, If I was making them I would machine a flange on the space to sit behing the seal, which might mean the bearing pocket needs to be machined deeper, or alternatively, go up a bore size and use a spacer that goes into the bore. It depends on what the geometry is like.

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...at least I got chicken.

Trust me, I'm an engineer

Dab of grease works wonders for keeping them in place when I do mine.

You'll find these on GP and Endurance race bikes where time spent wheel changing is wasted so you don't want to be chasing bits rolling down pit row

Why not on road bikes? Dunno - cost, manufacturing tolerences, the need to pay exhorbitant amounts when you lose one?

And you will lose one someday, there's half a dozen scattered over Derby in the last 40 years that I know of

Fair enough, if it's hassle I won't bother.

I did the conversion on a 96 blade, and the mudguard is then so close to the tyre that it's awkward to get the wheel back in. But if it's going to mean trying to fit oversize bearings then I CBA with that.

I think a tophat to fit behind the dust seal would help, but would also wear out the dust seal, and wouldn't even ensure the spacer stayed lined up, though it would stop it dropping all the way out at least.

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I used to be BlessMyCG, long ago in a dark place.
Love, peace and unity!

When your in your garage havin a fettle thats fine,starts raining as they call your race-not as effective.

Cost i would agree--but never seen any aftermarket ones,maybe not enough demand

Filings ect ect i can see that, but as it is obvious then assuming care is taken, would be worth it,
does fall into the what happens when a quick change is needed though.

Strength--as they do stay in place on thier own and with grease--do they really need to be that strongly magnectised--and is most of the strengh element taken via the wheel and axle,rather than the spacers.

Not being argumentative-just seeking to understand

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AKA  DNF-DALY

Most bikes have the majority of the suspension and wheel components made from Aluminium...bearings are steel though. Not much to 'magnetise' is there?

The spacers form a pretty substantial element of the beam stiffness of the axle, so they need to be reasonable decent stuff.

However, if its just for racing, glue the spacer to the bearing inner race with superglue. a bit of heat and it will break free again when you need to do bearings/seals.

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...at least I got chicken.

Trust me, I'm an engineer

Good shout--but 3 rear wheels 2 fronts one set of spacers for each.

I think ill just at her like i have for the last 7 years,when she mentions it next.

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Dunno

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AKA  DNF-DALY