R80/7 Spoked rear wheel problem

fatbaldbob · Jul 19, 2017

1979 R80/7 Spoked rear wheel issue: The rear hub is knackered and basically it will not hold a bearing, the outer shells just turn in the hub, i.e. they can be dropped straight in, no heat no pressing etc. Yes its the correct bearing. So after a few hundred miles they are knackered and I have a wobbly wheel.

I spoke to motor works this morning as they offer refurbished wheels for exchange, however they don't want mine as they say its not repairable, what they did suggest is to roughen up the hub put Araldite or similar in it, then fit the bearing. Anyone tried this, not convinced it would last long but I have nothing to lose. Motorworks did have some second hand wheels for sale, non refurbished but these are £375 before you add bearings and seals etc

Was taking another bike for mot this morning and was chatting to the mechanic ref the above and he suggested a slither of a coke can or similar to take up the slack, again anyone had any success doing this?

Any ideas, or has anyone got a spoked rear wheel for an R80/7 they want to sell?

dr nosh · Jul 19, 2017

You could shim the bearing, but would need to remain central to the axle centre.

Use a set of feeler gauges to determine the gap around the bearing.

Add a bit for an 'interference fit'.

Google 'shim stock'.

solidstate100 · Jul 19, 2017

Unless you have the offending area machined out and shimmed (or an insert installed) to proper tolerances, anything you do with home shimming/Aralditing/coke cans etc is unlikely to be very succesfull -as the hub is damaged it will be almost impossible to get anything properly central and you will be stuck with run out/wobbly wheel syndrome etc etc. That said, as its effectivley scrap (at least according to Motorworks), give the coke can and the Aradite (in that order) a go. I would.

Dennis the Menace · Jul 19, 2017

Could be easier to use a grade of Locktight bearing fit, it would be a piss fit, if you could get the thickness of the coke can around the bearing

Voyager · Jul 19, 2017

You could try installing a 'Speedi-Sleeve' (or equivalent), after the hub has been machined to take it.

http://www.skf.com/uk/products/New-Market-Offers/SKF-Speedi-Sleeve.html?=138442079996&keyword=speedi%20sleeve&matchtype=p

These are for fitting to shafts rather than inside housings, but I suspect the Engineering is the same, you just need to find the correct size.

You will need to strip the wheel - unless there is someone near you with an enormous lathe (Railway Repair Yard ?).

Let us know how you get on

.

Bob.

Beemerboff · Jul 20, 2017

The Speedi- Sleeve only provides a good surface for a seal if your shaft is worn- it doesnt seem to have anything to do with the bearing.
As previously suggested, Locktite probably have a product specifically for this situation, probably best asking a good independent bearing factor to pick the correct one for you.
There are better suppliers of high strength epoxies than Araldite too, and your bearing factor might have them too, if you try the bodge it and see route
There is also the possibility that a similar bearing can be altered to suit, perhaps an imperial one, or the hub can be opened out to take a slightly larger bearing, a specialist motorcycle engineering shop will probably be able to come up with something.

scooter paul · Jul 20, 2017

For what it's worth, and no two scenarios are going to be the same, amount of wear being the variable, I did have success with Loctite bearing fit in a BMW hub.
Paul.

fatbaldbob · Jul 20, 2017

Bodge update

Well today I have tried one of the suggested bodges; I cut some strips from a drinks can wrapped them around the outer bearing shells and tapped them home. I then rebuilt the wheel fitted it and much to my amazement it works

There is no movement at all and the wheel turns freely, there is of course no way of knowing how long it will last but it may just do until I source a new wheel, if it fails first decent ride then its back to the drawing board but noting lost but a bit of time.

BillN · Jul 20, 2017

fatbaldbob said:
Well today I have tried one of the suggested bodges; I cut some strips from a drinks can wrapped them around the outer bearing shells and tapped them home. I then rebuilt the wheel fitted it and much to my amazement it works There is no movement at all and the wheel turns freely, there is of course no way of knowing how long it will last but it may just do until I source a new wheel, if it fails first decent ride then its back to the drawing board but noting lost but a bit of time.

Is it at all dangerous at speed Bob?

fatbaldbob · Jul 20, 2017

BillN said:
Is it at all dangerous at speed Bob?

Speed? its an R80

Who knows, might last 5 minutes might last 5k miles, not give it a good run yet, but nothing ventured...blah

Rob Farmer · Jul 20, 2017

I have a 1978 spoked rear hub that has no wear at all and a brand new unused one. The unused one would be ridiculously expensive though but you could have the perfect one for £200.

BillN · Jul 20, 2017

fatbaldbob said:
Speed? its an R80

The my 1984 R80 Mono is as fast as my 1989 Porsche 911 3,2 Carrera over a standing quarter mile ... 12 or 13 sec if I remember correctly and the 0 to 60mph figures are about the same

I don't think I would ride one with a bit of coke can stuck in there!!

Dennis the Menace · Jul 20, 2017

BillN said:
The my 1984 R80 Mono is as fast as my 1989 Porsche 911 3,2 Carrera over a standing quarter mile ...

I don't think I would ride one with a bit of coke can stuck in there!!

Nor I

fatbaldbob · Jul 20, 2017

Dennis the Menace said:
Nor I

Its ok it wasn't coke it was schweps lemonade :beerjug:

fatbaldbob · Jul 20, 2017

Rob Farmer said:
I have a 1978 spoked rear hub that has no wear at all and a brand new unused one. The unused one would be ridiculously expensive though but you could have the perfect one for £200.

You have PM.

Rob Farmer · Jul 30, 2017

dug the hub out of storage pics below

they're a little dusty and the hub was covered in silicone grease before being put away, this will wash off.

Ijustwanttoseethephotos · Aug 2, 2017

I think it should read,' my 1989 Porsche Carrera is as slow as a BMW R80 over a standing quarter'.

SeanW · Aug 8, 2017

In case Rob's price was too steep, I'm going to be disposing of a pair of wire spoked R80 wheels soon. They're solid and servicable rather than immaculate.

mikeyboy · Aug 8, 2017

SeanW said:
In case Rob's price was too steep, I'm going to be disposing of a pair of wire spoked R80 wheels soon. They're solid and servicable rather than immaculate.

If the OP isn't interested ,I may well be

Mike 07786 340692

Rob Farmer · Aug 9, 2017

SeanW said:
In case Rob's price was too steep, I'm going to be disposing of a pair of wire spoked R80 wheels soon. They're solid and servicable rather than immaculate.

Not too steep. Hub has been bought, shipped and taken to the wheel builder.

These aren't bits I really want to be selling they're my good bits for keeping my own bikes on the road but if some ones in the shit I'll try and help out. I've had to pay top dollar to get them they certainly weren't free.

R80/7 Spoked rear wheel problem

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