Went to the LBS today who I have a decent level of faith in, also have a few shops around my area so not just a one off place.
The mechanic went about taking the crown race off the old forks and fitting it onto the new ones. However, he found that under a considerable amount of force, the crown race wouldnt sit completely flush with the fork crown on the new forks (max 1mm gap).
The gap is equal all the way around the fork (i.e. not lop slided) and as a result, once the fork is installed the steering is not impaired in any way, nor is there any other abnormal noise etc.
The mechanic said to me that providing that the gap is equal all the way around and the steering isnt hindered, it is completely fine to ride. However, he did offer to do some sanding if I wasnt completely happy.
Just want to get some others opinions - would you ride it, or should I ask for it to be sanded, or perhaps see if it beds in over time?
There is quite a difference between various bottom collars and steerer sizes, it can be a bit of a problem.
You'd be better off taking a Dremmel to the bottom crown ring rather than the fork.
Attention needs to be paid to make sure the crown isn't left with burrs or edges and needs to be a nice fit.
A gap isn't a good idea....it'll lead to an area where the stress levels are raised and could lead to failiure in the longer term.
If neither of these are possible a good solution could be to add a spacer under the crown that'll fill the gap (but that is a final solution really if nothing else works)
Years ago when full carbon forks first arrived on the scene I had a similar problem with a LOOK fork, I ended up filing it down to get a good interference fit. I was working in the Composite and Laminate industry at the time and came to the conclusion that there was enough material around the crown and steerer to make it an acceptable solution. But these days some of the forks are very light in material weight around the steerer area (in the search for weight reduction)
What I'm trying to say is......only mess with the steerer as a last solution.
(edit) If you want to send me some pics or a PM, to assess the state of the fork/crown joint feel free.
tinchy wrote:The mechanic said to me that providing that the gap is equal all the way around and the steering isnt hindered, it is completely fine to ride.
That seems like it's going to create even more stress on what is already a highly stressed area at the junction of the crown and steerer. The crown race has to sit all the way down on the crown. What fork did the race come off of? Also contact the seller and ask them if they had the same problem.
Edited to clarify what I was responding to
That's where the skill of a bike wrench with real engineering background shows over a bike shop monkey with a certificate.
Fork steerer seats can be filed and sanded, but not by some monkey. You need to be sure whoever does the modifications knows what they're doing.
An over compressed headset crown could potentially do more damage to a steerer tube than a bit of light relief to the surface (which has a significant level of resin without fibres)
Do not sand or file anything unless the person doing the job knows what they are doing.
The crown race cutting tool is absolutely not for a full carbon fork. (It's an old school tool for steel or alloy forks)
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