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A Note on Sturmey-Archer FRONT hubs

Posted by Raleigh Twenty on June 23, 2010 at 10:56 AM

My brown Raleigh Twenty has the original Sturmey-Archer front hub, which has a few perculiarities when it comes to hubs.


1.) There are no lock-nuts.

2.) It matters which way you put the front wheel into the forks.

3.) Get it wrong, and you're in for a headache!


Sturmey-Archer, and I imagine a number of other British manufacturers did not have lock-nuts on their front hubs. Now this is the most important thing for you to remember.


ADJUSTABLE CONE GOES ON THE LEFT!


There is an adjustable and a non-adjustable cone.


- The non-adjustable cone screws in until it runs out of threads - (there is a shoulder on the axle for this). This cone is round - ie has no flats for cone wrenches.


- The adjustable cone has no lock-nut, so just screws in. This one has a pair of flats for a cone-wrench.


The front forks are key-holed - ie the axle won't just slip out, you need to spread them slight, as the cones have a shoulder which fits inside the round part of the fork end - a way of ensuring that a loose axle nut will not result in a front wheel falling out of the forks.


ADJUSTABLE CONE GOES ON THE LEFT!!!


Pictures wll follow.

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9 Comments

Reply Velo Lobo
5:11 PM on June 24, 2010 
Thanks, raleightwenty. I thought something was seriously wrong the first time I tried to put on the front wheel.
Reply 2whls3spds
3:14 PM on June 27, 2010 
And the friggin' things are NARROW. I trashed a Raleigh front hub a while back and found out that 90mm hubs don't exist in the real world. Fortunately found a spare hub in the hell box and was able to lace it into a wheel. On a full sized bike you can probably cold set the forks to a wider dimension, but I don't think I want to try that on a Twenty.

Aaron
Reply Raleigh Twenty
11:35 PM on June 27, 2010 
2whls3spds says...
And the friggin' things are NARROW. I trashed a Raleigh front hub a while back and found out that 90mm hubs don't exist in the real world. Fortunately found a spare hub in the hell box and was able to lace it into a wheel. On a full sized bike you can probably cold set the forks to a wider dimension, but I don't think I want to try that on a Twenty.

Aaron


Aaron,

I have spread another pair of forks out to 100mm on my other Twenty. It's more a mixture of ignorance and brute force than any fine art, but it is possible. The slots also need to be filed open slightly to accomodate modern standard axles which are larger than the old sturmey-archer axles.
Reply RichardM
9:07 AM on June 28, 2010 
I spread my forks easily to 100mm, using threaded bar with nuts and washers on the inside of the dropouts, then filed the jaws of the dropouts to take the wider axle.
Reply 2whls3spds
2:19 AM on July 8, 2010 
The one and only time I tried to spread a Raleigh thimble fork it broke. The right side leg snapped off at the weld. I guess it must have been a weak weld on that particular fork. I may give it another try here soon and hope for better results.

Aaron
Reply Internet Romeo
3:48 AM on July 16, 2010 
How do we add to the blog?
Reply Internet Romeo
3:48 AM on July 16, 2010 
How do we add a blog I mean???
Reply mr_colostomy
6:20 AM on July 19, 2010 
2whls3spds says...
And the friggin' things are NARROW. I trashed a Raleigh front hub a while back and found out that 90mm hubs don't exist in the real world. Fortunately found a spare hub in the hell box and was able to lace it into a wheel. On a full sized bike you can probably cold set the forks to a wider dimension, but I don't think I want to try that on a Twenty.

Aaron


Its not too hard to spread them, as Richard said, a threaded rod is probably best. I just fut my foot on one fork blade and pulled the other until I felt a little give. I added about 15 mm of spread which the bolts on the new wheel reduced back down to 10.
Reply George
3:00 PM on February 18, 2011 
Does anyone know what dimension cone wrench I'd need for a Raleigh Twenty?