Which should be the ideal space between tire and fender?
Is a 10mm space enough?
Another relative question. I have read that is difficult, but not impossible, to fit a fender under a short reach brake. Will a short reach brake fit on a frame hosting 40mm tires, or larger, and fenders?
Thinking about it a little more...
10mm the distance between the hole for the brake's bolt and the bottom of the frame (where the "wheel hosting space" starts)
+5mm (minimum) clearance
The short reach brakes have a maximum reach of 59mm without exception
Removing what above calculated are remaining 44mm. These 44mm are the space where the wheel (tire and rim) is inside the brake callipers.
Removing 8-10mm more (the rim's surface for the pads), remaining 34-36mm.
So, a short reach brake with maximum reach of 59mm could host a 34-36mm wide tire (or a smaller tire and fender).
Am I wrong?
Last edited by yannis; 05-20-12 at 07:45 PM.
10 mm between the tire and the inside of the fender is plenty. 5 mm clearance is marginal if any mud or debris gets between the tire and the fender. BTW "short reach' brakes have a amximum extension of typically 47-49 mm. "Long reach" have an maximum extension of 57 -59 mm. I expect neither will clear a 40 mm tire.
This should be an ultra short reach brake calliper.
Originally Posted by HillRider
Andrew R Stewart
You can do the math/diagraming easily enough. But there's a reason that cantis/linears are used on large profiled tires, espicially with fenders. The leverage goes down with the longer caliper arms needed to clear the big tires and fenders. But then you probably already knew this. Andy.
Not in today's terminology.
Originally Posted by yannis
People have fabricated mounts for mudguards,
that cover the tire every where but
where the clearance under the brake is insufficient.
Do you mean that short reach brakes have not the sufficient power to stop wider rims?
Originally Posted by Andrew R Stewart
I have heard about it and also something similar about the length and the shape of the brake levers, but I am not an expert...
Could you explain me with more details the relationship between rim width and caliper arm length?
Short reach brakes have plenty of power to stop wider rims. What they may not have is sufficient room under them to clear the wider, taller tires that normally accompany wider rims.
Andrew R Stewart