It is currently 19 Mar 2024 06:24

All times are UTC




Post new topic  Reply to topic  [ 52 posts ]  Go to page 1 2 3 4 Next
Author Message
 Post subject: Tuber front wheel spacer
PostPosted: 02 Sep 2014 22:29 
Offline
proff. patpending
User avatar

Joined: 06 May 2009 20:20
Posts: 14705
Current ride: Victoria Sponge
Location: Bristol - Gateway to all things good
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...

_________________
08 Specialized Langster


Top
 Post subject: Tuber front wheel spacer
PostPosted: 02 Sep 2014 22:56 
Offline
User avatar

Joined: 12 May 2009 18:38
Posts: 246
Current ride: Buell S1, Buell S3T
Location: Turriff - Aberdeenshire
I will have one please nick.

_________________
1998 Buell S1
1998 Buell S3T


Top
PostPosted: 02 Sep 2014 23:05 
Offline

Joined: 20 Sep 2009 20:42
Posts: 598
Current ride: XB12SS Tiger S R9T
Location: Barlick Yorkshire
So which wheels were lightest?


Top
PostPosted: 02 Sep 2014 23:24 
Offline
proff. patpending
User avatar

Joined: 06 May 2009 20:20
Posts: 14705
Current ride: Victoria Sponge
Location: Bristol - Gateway to all things good
Cast front 5040g
Cast rear 6820g
PM front 4960g
PM rear 6280g
Dymag TTX front 3220g
Dymag TTX rear 4760g

_________________
08 Specialized Langster


Top
PostPosted: 02 Sep 2014 23:52 
Offline
User avatar

Joined: 22 May 2009 18:43
Posts: 3189
Current ride: S1`s
Location: Llanelli South Wales
:shock: 5 please, recent fecked bearing and trashed spacer.


Top
PostPosted: 03 Sep 2014 00:38 
Offline
User avatar

Joined: 07 May 2009 12:06
Posts: 487
Current ride: 2001 M2
I'm interested Nick, how much do you think you'll be able to knock these out for?


Top
PostPosted: 03 Sep 2014 06:20 
Offline
proff. patpending
User avatar

Joined: 06 May 2009 20:20
Posts: 14705
Current ride: Victoria Sponge
Location: Bristol - Gateway to all things good
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).

_________________
08 Specialized Langster


Top
PostPosted: 03 Sep 2014 07:53 
Offline
User avatar

Joined: 23 May 2010 10:44
Posts: 154
Current ride: X1W m2
Location: oxfordshire
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 !!!

_________________
X1 Whitelightning 2002
S3T 2000
Montessa Cota 349 1982
Kawasaki Hardtail 1983
Beta rev3 250


Top
PostPosted: 03 Sep 2014 08:22 
Offline
User avatar

Joined: 06 May 2009 16:03
Posts: 4389
Current ride: S1w X1 1125CR
Location: NNW of Sarfampton
If you get enough time to knock some up, I'll have one please Pash. :old:

_________________
I'm a Hornithologist, I get excited by exotic birds.........


Top
PostPosted: 03 Sep 2014 09:08 
Offline

Joined: 14 Sep 2009 22:15
Posts: 203
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.


Top
PostPosted: 03 Sep 2014 09:11 
Offline
User avatar

Joined: 06 May 2009 19:42
Posts: 3133
Current ride: M2 Razorback
Location: Mouth of the Port in the Shire of Hamp
Good work Nick, top man :worthy:
Please put me down for one but no rush.

_________________
'98 M2 Razorback, it's a keeper.


Top
PostPosted: 03 Sep 2014 09:35 
Offline
proff. patpending
User avatar

Joined: 06 May 2009 20:20
Posts: 14705
Current ride: Victoria Sponge
Location: Bristol - Gateway to all things good
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...

_________________
08 Specialized Langster


Top
PostPosted: 03 Sep 2014 09:37 
Offline
proff. patpending
User avatar

Joined: 06 May 2009 20:20
Posts: 14705
Current ride: Victoria Sponge
Location: Bristol - Gateway to all things good
Me - 2
Neilc - 1
Topgumm - 5
Lacy - 1
Thunderer - 2
Deepsex - 1
Rik -1
Kevmean - 2
DaveH - 1
Graeme1203 - 1

_________________
08 Specialized Langster


Top
PostPosted: 03 Sep 2014 13:03 
Offline
User avatar

Joined: 01 Oct 2013 12:05
Posts: 902
Current ride: 97 M2, 09 XT
Location: Sunny Suffolk
Yes please sir, just the one thanks

_________________
Today my pet mouse Elvis died :cry: ..................He was caught in a trap
There are two types of people in this world, those that can extrapolate


Top
PostPosted: 03 Sep 2014 13:11 
Offline
proff. patpending
User avatar

Joined: 06 May 2009 20:20
Posts: 14705
Current ride: Victoria Sponge
Location: Bristol - Gateway to all things good
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...

_________________
08 Specialized Langster


Top
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 52 posts ]  Go to page 1 2 3 4 Next

All times are UTC


Who is online

Users browsing this forum: No registered users and 3 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Limited