Rear wheel bearings.

[Dom_]

My bike decided to eat a rear wheel bearing today, and the bike is at a mates (Shellshock/Distortions house), and is totally un-rideable.

Now i've found a site that tells me the stock wheel bearings are either SKF 6201 and 6202 - is this an aprilia bearing,,or to you experts out there, does it look like a general size. So could i go to a shop tomorrow and ask for a SKF 6202 and they would know what i'm on about??

Thanks, Dom.

p.s. i work for dk, so on saturday when i realised they were on there way out i asked how much they were, and they said if i could find the sizes they could get them for about a fiver each, but if not they will have to order aprilia ones for £13.95 each. So i really need to know the sizes!!!

[Kickstart]

Hi

They are standard common bearings. £4.50 each from M&P I think. 6201 is used on the front of the NS125 and a 6202 is used on the front of an NSR125 according to an old catalogue I have floating round.

Dimensions a 6201 is 12 x 32 x 10 (inside diameter x outside diameter x depth) and a 6020 is 15 x 35 x 11.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[ash t]

Jesus Christ...Is there ANYTHING you dont know???


LOL
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When You're Starting To Choke, Take Some Pills With Your Coke, Its Hyserical

[Dom_]

[Kickstart]

Hi

Those bearings should be easy to source. Most bike shops probably have them in stock.

I would take the old bearings out and double check the sizes. You also want to ensure that there is only 2 bearings in there (some Yamahas have 2 bearings on the chain side and one on the brake side, plus another in the sprocker carrier).

Once you have made sure the codes are right then just pick some new ones up. Get the bearings with 2RS at the end of the code (2 rubber seals).

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Dr Nick]

The company that makes those bearings for Aprilia is shite apparently, find a local Bearing place near you and they will be able to make you one there and then, should be cheaper than the aprilia shite too. Bearing also went on my 50.
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is that it

[Dom_]

[R4nger]

I heard DK was sh!te aswell.

[Dr Nick]

[Dr Nick]

Oh yer, do them both at the same time, i found that out the hardway .
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is that it

[Kickstart]

Hi

There are loads of bearing suppliers. Don't know if Aprilia ones are worse than anyone elses, but I have a 17 year old Aprilia in the garage which has the original rear wheel bearings. Bearings from the bike maker are always expensive.

Definatly replace both bearings in the wheel at the same time.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[cagiva gezzer]

My ones from M&P were the same brand as the ones in my cagiva and the ones being sold by three cross for three times the cost.
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"because one stroke isnt enough and four strokes waste two"

[Dom_]

Oh dear It's worse than i thought, the bearings ate the thing that goes in my wheel (not the spindle) and ate the innards of my wheel.

Any advise as to what to do ??

Thanks.

[BFG]

[Kickstart]

Hi

If I am looking at those pictures correctly it has wrecked the spacer that goes between the bearings (probably not too bad on its own) but also looks like it has chewed up the inside of the wheel. That spacer is fairly tough metal normally, and the ball bearings are likely to do far more damage to the soft alloy of the wheel.

It the bearing outer had not spun then the wheel might be OK, but you cannot see the damage on the inside of the wheel which worries me a bit.

I would be inclined to try and find a good 2nd hand wheel. Rear wheels should be easy to find and cheaper.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Dom_]

[Kickstart]

Hi

I would be far more worried about the damage to the wheel than to the spacer.

The spacer it only really there to support the centres of the bearings. Basically the load you put in them when you tighten the rear wheel spindle.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Dom_]

So what damage am i to look for on the wheel then??

The inside is still scratched

[Kickstart]

Hi

Similar wear on the inside of the spindle area as there is on that spacer.

In reality it might be fine with such damage, but I would be very dubious about trusting it.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Dom_]

I'll go down DK this week as i know they have an rs50 in for breaking. I had the brand new tyre off it, now i'm having the wheel as well. lol.

Just hope they don't want too much for it.

Also, would the spacer not grind against the insied of the wheel with such damage to the wheel?? Thats if i used to original wheel and got a new spacer.

[BFG]

Agree with Kickstart.

It's a 50?? The wheels tend to be over-engineered. Look at the photos. The hub part is connected to the rest of the wheel by thin ribs. The thickness of the hub is not always done for performance strength - it is often done to prevent distortion during machining in the factory. Point being - there might be more than enough strength left even with the wear. If the thickness of the remaining material is at least twice the thickness of the ribs - this would make the decision for me if it were my bike.

But we all agree - this is the risk. It's impossible to say via photos on the net.

Don't forget the risks with second hand wheels are also quite significant. Given what can happen to alloy with impact / heat damage - invisible hairline cracks etc. Will you replace one visible risk with another invisible one? But - as said they are over-engineered though.


I would strongly recommend - Have an engineer look your existing wheel. Also - the bearing seats must be perfect!!

[Dom_]

I'll take the lot down to andys and see what they say, then i'll go to dk and see what they say.

Then post my findings.

Thanks fpr the help.

Dom.

[Dom_]

Right, i finally got the last bits of the bearing out, here is what it now looks like. There is only a few mm of metal that will be able to hold the new bearing in, and tbh i dont think it's enough.

What do you think??

[Kickstart]

Hi

Not sure how much is really missing.

To be honest I would be tempted to just fit new bearings, but also just as tempted to do the job properly and get a fresh wheel.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[BFG]