The JR counter will fit on most bicycles without modification. Remove the wheel from the bicycle and slip the counter over the axle on the LEFT side. Put the wheel back on the bicycle with the counter between the fork and the wheel. Tighten the wheel securing nut or lever.
Counter mounted on bicycle.
CAUTION: IMPORTANT - DO NOT ATTEMPT TO ROTATE THE WHEEL OR RIDE THE BICYCLE UNTIL YOU HAVE CHECKED FOR PROPER CLEARANCE. YOU MAY DAMAGE THE COUNTER.
Wiggle the wheel back and forth just a little. If the large counter gear rubs against the fork the fit is not correct. This can be sometimes be corrected by installing a washer between the outer side of the counter and the inside of the fork. Try this. If free rotation without rubbing cannot be obtained, the counter cannot be used on your bicycle.
Check for clearances!
If there is interference between the small plastic gear and the spokes, install a washer between the inside of the counter and the adjusting nut on the wheel.
If you are unable to fit the counter to the bicycle using washers, it may not be possible to use the counter on the bike.
Again – before attempting to rotate the wheel, check for interference. If you do not do this you will damage the counter. We will not be responsible for damage due to improper installation.
BROKEN TANG OR OTHER PROBLEM
The Jones Counter, model JR, fits the majority of bikes with no modification. However, some bikes have front wheel geometry that makes installation difficult. In some cases, the drive tang (the little bent-over piece that is pushed by a spoke) gets bent or breaks off. This is usually caused by inattention during installation. When the counter is put on the bike, and the axle nut tightened, there must be some play, or shake, in the mechanism. If there is any binding at all, the unit must not be used until the binding is eliminated. If this is not done, the tang may be bent or broken.
We supply replacement chassis to fix bent ones, but there may be a better way.
Here is an improved way to fix a broken tang. It uses two pieces of wire.
Each piece is bent into a tight “U” that is just big enough to fit the edge of the tang hole. The piece is hooked into the tang hole, and the other end twisted around a pair of intersecting spokes. One wire pulls the gear in the forward direction, and the second in the reverse direction.
Be careful not to over-tighten – a very small amount of slack is desirable.
The direction of pull is such that the large gear is pulled slightly in the outward direction, and acts in the plane of the gear. This results in less friction in the gear mechanism.
The manufacturer of the Veeder-Root counter used on the Jones counter recommends that rotation not exceed 500 rpm. In riding terms this amounts to about 15 mph or 25 km/hr. Many get away with riding faster, but forewarned is forearmed. Overspeed may cause damage to the working parts of the counter.