THE RALEIGH TWENTY
Your ever-expanding web resource for the Raleigh Twenty
Blog
A Note on Sturmey-Archer FRONT hubs
|
|
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.
Categories: None
Post a Comment
Oops!
The words you entered did not match the given text. Please try again.
9 Comments
Aaron
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.
Aaron
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.
Oops!
Oops, you forgot something.