This was fun. (Ok, I was bored in bed with a cold)
As it was raining and this is what I had been thinking about all morning, I went out to the garage, got my Vernier Callipers out and got measuring. Not something you think or talk about generally, but may be of interest to some people in my situation. Keep in mind that my Vernier Calliper is a cheap and nasty item so these measurements may be "slightly" off.
1. Rockshox Tora 289 disc fork had a perfect 9.00mm slot for axles on one side and 9.10 on the other. Oooh ! Probably paint and muck.
2. Steel MTB non-disc V brake fork had a 9.75mm slots for the 9mm QR axle supplied. Ahhhh ! (I must have done 1000 miles on this fork, often loaded like a donkey.) Looked OK.
3. Yuba Mundo V3 disc fork had a 10.10mm slot and a perfect 10mm on the other leg. Cooorr ! Probably paint again making for the difference.
4. My "standard" 9mm QR axle came in at 8,82mm in diameter... argh !
5. My original V2 Yuba Mundo front axle came in at 9.52mm diameter... ( I could see a slight gap between it and the drop out.) Looked OK.
Is it Ok to run a standard 9mm QR in a 10.10ish slot with brake discs ? I get the feeling some people are going to do this without seeing an issue.
Or do I need a special 9,52mm axle disc hub up front ?
Looking at the numbers and fitted it looks really sloppy, it would probably work for a ride around the block, but discs do load axles, so I am faffing around on the internet trying to find somebody with THE knowledge. The Yuba is such a pick and mix of fun industry standards that it is quite unique and not always easy to follow on the best of days
My worry since I first popped a wheel in these forks is that the gap between the 9mm axle and the larger fork drop out slot edge would allow flex/axle movement/slip under load, over stress the skewer and/or make the brakes/forks judder. Or even lead to wheel loss.
I hope that this will be a simple general knowledge question, and that the cough medecine will wear off soon and my mind will clear.
I will probably learn that each manufacturer is slightly off the industry standard anyway depending on the day of the week or whats on the radio, that bike manufacturing is not aerospace manufacturing. But this is a bit off for me. I want to keep my teeth and avoid front wheel loss incidents...
Aren't home builds fun... there is always something that you don't know for sure... and this must be my 20th something bike build !
Opinions and knowledge welcome !
And round again…
1 week ago