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 Post subject: Tuber front wheel spacer
PostPosted: Tue Sep 02, 2014 10:29 pm 
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proff. patpending
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Whilst swapping wheels on my X1, I found the front wheel bearings shot. It didn't bother me cos the wheel was scuffed and I was putting another one on...

Last week I decided to try my new scales out and weigh a set of cast wheels, a set of PMs and a set of Dymags. To make it fair I removed the tyres and the bearings...

On closer inspection, the centre spacer for the cast wheels (with the shot bearings) looked like this:

Image Image


Why??? Look at the wall thickness at the ends...

Image

The spacer is a 25mm OD tube with a 17mm ID, but there is a 8mm deep 20.5mm counterbore each end...
Image

...so the minimum area is 161mm^2... And it got crushed, probably by a gorilla with a big spanner...

Obviously the wheel can't go back together again like this, especially because, and get this, the distance between the bearing shoulders is measured as 75.3mm but the length of the spacer was measured as 74.1mm, so crushing, either with worn bearings or in damaging the bearings, has occurred...

The solution...

Well, the bearing itself, a 6204...
Image

...has an inner race ID of 20mm and an OD of 29mm, so it would make sense to have a spacer to suit those dimensions, cos any increase in area, as in the central part of the standard spacer, will do nothing to help the ends...

Best I could come up with was 30mm OD and 20mm ID.
Image

On the contact area of the bearing, this gives 346mm^2 area, 2.15 times the minimum area of the original spacer. This means the spacer can withstand over twice the load of the original spacer (assuming the same material - 6082T6) without deformation. Not that it will need to cos we will be sensible with the torque wrench...

Big length of tube ordered, Length will be 77mm, non-disc side bearing in first...

Question is, how many more crushed spacers are there on UKBEG front wheels? Let me know if you want a spacer made up...

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 Post subject: Tuber front wheel spacer
PostPosted: Tue Sep 02, 2014 10:56 pm 
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Current ride: Buell S3T
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I will have one please nick.

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PostPosted: Tue Sep 02, 2014 11:05 pm 
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So which wheels were lightest?


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PostPosted: Tue Sep 02, 2014 11:24 pm 
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proff. patpending
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Cast front 5040g
Cast rear 6820g
PM front 4960g
PM rear 6280g
Dymag TTX front 3220g
Dymag TTX rear 4760g

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PostPosted: Tue Sep 02, 2014 11:52 pm 
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Current ride: S1`s
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:shock: 5 please, recent fecked bearing and trashed spacer.


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PostPosted: Wed Sep 03, 2014 12:38 am 
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Current ride: 2001 M2
I'm interested Nick, how much do you think you'll be able to knock these out for?


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PostPosted: Wed Sep 03, 2014 6:20 am 
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proff. patpending
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Lacy wrote:
I'm interested Nick, how much do you think you'll be able to knock these out for?


[cost of tube] x [spacer length] / [tube length] + [£1 donation towards tool wear, electrickery etc.] + [jiffy bag] + [postage]

About £4.60 each (30% of that is stamp and envelope - unit cost will be less if you have more than one) which is under 30% of the cost of one from HDB. <why am I justifying such a low cost?>

I'll trial one out first. If the tube is here by the weekend I'll take some to Jacks Hill on Sunday (if there are any left).

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PostPosted: Wed Sep 03, 2014 7:53 am 
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I have also noticed this on a spare set of wheels I purchased, ended up using my original spacer. I could do with 1 maybe 2 and I'm going on sunday !!!

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PostPosted: Wed Sep 03, 2014 8:22 am 
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If you get enough time to knock some up, I'll have one please Pash. :old:

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PostPosted: Wed Sep 03, 2014 9:08 am 
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Location: north wales
Had the same problem with crushed spacer, would go through a set of bearings in 1k miles.
I made one out of stainless tube on me lathe, yes it weighs more but no more failing bearings YET.
At the time know body could give me dimensions of the spacer so i bought a genuine to get the exact dimensions.
I'm surprised none of the aftermarket retailers dont sell a upgraded spacer kit for our bikes.
So its a great post Nick, should be a sticky or in how to.
Check your spacer folks.


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PostPosted: Wed Sep 03, 2014 9:11 am 
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Good work Nick, top man :worthy:
Please put me down for one but no rush.

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PostPosted: Wed Sep 03, 2014 9:35 am 
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proff. patpending
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I would have done them out of stainless but I can't find any 20mm ID pipe/tube with a wall thickness greater than 1.5mm and I don't really want to blunt my 20mm drill carving them out of barstock...

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PostPosted: Wed Sep 03, 2014 9:37 am 
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PostPosted: Wed Sep 03, 2014 1:03 pm 
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Yes please sir, just the one thanks

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PostPosted: Wed Sep 03, 2014 1:11 pm 
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proff. patpending
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We may get let down by postage since they are 30mm in diameter... So it may e £2.80 in stamps...

Pickup at Jacks Hill will be way cheaper...

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