Originally Posted by robalong

I've done this a few times, after seeking out info online. However, I've never come across this wee factoid that came to mind during my last cold-setting adventure. Seems one can buy an internal expander, to achieve the desired effect ... widen the gap using the adjusting nuts until the gap is greater than desired but springs back to the correct gap. Something like that.


Here is my technique, that can be applied to widening or narrowing the gap. This example deals with widening:


Rear fork width - 126mm

Desired fork width - 130mm

Difference - 4mm


So, I bend one side until the gap is 128mm, taking care not to alter the position of the other side. Then I bend the other side until the gap is 130mm, taking care not to alter the other side.


Result! Gap widened perfectly in line with the frame.


I genuinely have never seen this mathematical method outlined in detail anywhere online. Sometimes, it seems to be inferred as 'obvious', but never explained in words and simple maths.


I hope this will be useful to someone.


Cheers!