Grimeca Rear Hub Bearings

N

Normski

Senior member
Location
Devon, England
Hi, has anyone sourced new original bearings for these hubs? or has anyone used the twin row alternative which seems to be all that is available now? (Paul??)

Thanks norman
 
Norm,

As far as I know, the double row bearing was always used on the drive side.

Can check for you tomorrow, good chance they are in stock.

piet
 
Hi Norman,

I used the double row bearing but can't report since I have yet to ride the bike.
They are not original fitment though.
Paul
 
Thank you Piet & Paul,

I wasn't able to look in the Green Book last night and was a little vague and hasty posting. The bearings I'm talking about are the pair of 17x40x17.5 fitted to a Grimeca rear wheel hub. They appear to be unavailable as single row ball bearings but are available in this size as Double Row bearings. Paul had mentioned this to me some time ago and I am interested to see if anyone has either sourced some single row bearings or tried the double row ones in anger. Another way to go may be to use 17x40x16 single row bearings with spacers.

Opinions please!

Thanks Norman
 
Hi Norman
Whilst doing something completely different (changing primary chains on my SF2), I was cross referencing between the Green Book and the french Revue Moto Technique ( my future ex wife is still keeping all my factory docs hostage!), I came across the following, the french book mentions a double row bearing in the Grimeca hub, the Green Book doesn't.
Another mystery solved.
Hope that helps and chases any qualms about using a double row bearing.
All the best
Paul
 
Thanks Paul,

I'll go with the double row with more confidence now, put the tyres on the very shiny rims yesterday, quite a nervewracking experience :)

Cheers Norman
 
In mine I have 2no. 20x47x16 bearings separated by Lav. part #1007M Distance piece (for flange) and 782M Distance bush.

The bearings were easily obtained but the bushes were not! Mine were 'rescued' by the very nice man at my local bearings place, who are also very sensibly priced (cheaper than simplybearings.co...).

J
 
Thanks James,
My concerns with the twin row bearing would be that the individual bearings could be too small with the need to fit 2 rows in, and maybe too laterally stiff? but with Paul having found a reference to them being 'officially' used I'm happy to use them.
Cheers Norman
 
Hi James,
I'm somewhat surprised by the size you quote. The Grimeca rear hub bearings are originaly 17X40X17,5, an unusual size; the sprocket carrier bearings are 20X47X14. Nowhere is there a 16 mm diameter quoted, neither in the Grimeca or Laverda hub.
All the best
Paul
 
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