Disc brakes on bikes
Disc brakes on bikes
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The presence of the brake disk assembly is generally on the left hand side of the wheel as it’s ridden, and has no effect on counter operation.
As much as we would like to have a one-size-fits-all counter, it’s just not feasible, so we aimed for the most common hub size.
We have suggested purchasing a cheap front wheel with a 2 inch hub, and using it as the wheel of choice while measuring. I have not heard yet that anyone has done this. Considering that riding speed should not exceed 15 mph, the lack of a front brake is not much of problem. I never used my front brake while measuring anyway.
Pete, I am not sure I would want to run without front brakes since you need to lock the front wheel for many measuring maneuvers.
Renewal of an old subject. Modern bikes with disc brakes have a wide variety of front forks and wheel hubs. I think the right hand mount JR counter has the best chance. The left hand counter runs backward when mounted on the right. I suppose that no accuracy is lost, but the arithmetic becomes tricky. Also many newer bikes have various do-dads on the fork ends, many associated with disc brakes. The only answer I can think of is to bring the JR counter to the bike shop when shopping. Any one have any other advice? Pete Reigel used to have photos of what worked, anyone have photos of what won't work?
I just got a new bike. I took my handlebar Jones/Lucas counter to the shop when I went to pick up the bike, and I had the capable mechanic install it. Since this is my first bike with disc brakes, the counter had to be placed on the other side, so the numbers run backwards. I measured a 5K a couple of days ago with no issues with the numbers. I can see where measuring longer courses may require some more careful "bookkeeping" while measuring with numbers running in reverse. But so far, so good.
My Oerth counter ran backwards for years. Acutally made subtraction more logical: top number - bottom number. Matthew Studholme said he never got use to backwards arithmetic in filings.
Have you tried going thru puddles, dirt and chat yet?
The current version of the JR counter is designed to mount on the right side to avoid the disc brake issue.
Some Electric assist bikes use a 15mm or larger "Through bolt" axle. Often they also utilize a large flange hub.
A standard Jones counter will work for these applications BUT only after the counter is modified. Modification requires enlarging the center hole (usually to 17+mm) and removing and replacing the drive tang on the large gear. Enlarging the center causes the chassis to come apart. Reassembly is accomplished by use of a 2 part adhesive. The tang is replaced by welding a piece of a bike spoke long enough to clear the front hub.
This works well, but it does require some labor and is a special order item.