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I laced a Velocity Cliffhanger rim to a moped hub using motorcycle spokes and nipples. The video shows how this was done as well as how the spoke tension was measured indirectly.

Hi i’m bill mold i work at the spokes that cetera store on north quaker lane in alexandria and my job is to build custom wheels and the wheel i want to show you is the one that was probably the greatest science and engineering challenge of anything that i’ve built so far and i’m going to show you the the details of this but this is basically a hub from a moped

Which i have laced up to a bicycle rim so that a college professor and convert an old moped into a modern-day equivalent of a board track racer if you’re not sure what a board track racer is google that and you’ll be in for some interesting photos for sure now the first challenge was figuring out what kind of spokes and rim to use and i opted to use motorcycle

Spokes that i had to use motorcycle spokes because the holes in the hub are so large that the head of a bicycle spoke would pull right through the hole which meant that i had to use motorcycle spokes here’s a close-up of one side of the hub that’s one of the holes in the hub and you can see it’s a pretty large hole so this normal bicycle spoke the head of the

Spoke is way too small and the diameter of the spoke is too small it would just pull right through the whole motorcycle spokes of course come with motorcycle nipples and those nipples are much too big to go through a bicycle rim and that necessitated drilling out all of these holes in the rim not only in the front where the nipple comes through but in the back

Where the back of the nipple goes through to accommodate the enormous nipples that go with motorcycle spokes so you can see one problem led to another and that i had to space out with washers the space between the spoke and the hub flanges to take up some of the excess space and the length of the the elbow of the motorcycle spokes i used this velocity cliff hanger

Rim because it’s a very strong rim i could get it in the 26 inch size that i needed and i know that there’s a lot of aluminum in the spoke bed so i knew that i could drill out the spoke bed too the larger motorcycle nipples without weakening of the spoke back buy too much here is a velocity cliffhanger rim laced up with bicycle spokes and nipples this is the same

Rim using motorcycle spokes and motorcycle nipples and here is a comparison of the two so i used a variety of nylon washers of different dimensions to take up the excess space in the length of the elbow of the spoke so i supported the hub so it wouldn’t fall over and then stacked up some videos to support the rim at about the right height and then i just laid in

Some spokes using silver spokes for one direction and blacks books for the other to try to figure out a lacing pattern and i settled on a two cross pattern that i thought would be correct and that enabled me to then make the measurements so i could calculate the correct length of the spokes i’d need and then i had to figure out how to attention the wheel and what

I did was i used my supreme tensiometer and used known tension readings for some round smokes of smaller diameter and plotted a graph which turned out to be straight line graph and i extrapolated that to the dimension of these spokes here to give me what i think is a fairly good idea of what the tension is on these folks here because no bicycle tensiometer is made

To measure these kinds of spoke tensions directly this is my supreme digital tensiometer and note the high-end mitte toyo gauge this is the conversion table that comes with the subpoena 10g ometer this row represents the tension i want on the spokes measured either as eleven hundred and seventy-seven newtons or 120 kilograms of force i plotted a graph the x axis

Measures the spoke diameter and millimeters and the y axis is the deflection of the 10g ometer also in millimeters using the conversion chart that comes with a supreme 10g ometer i looked at five diameters of spokes a 1.5 millimeter a 1.7 a 1.8 a 2 and a 2 point 3 & 4 those same five diameters if i look at the deflection i will get with 120 kilograms of force

This is the reading for the 1.5 the 1.7 the 1.8 the 2 and the 2.3 those combinations give me 5 plot points on the graph with the coordinates in parenthesis i can connect those 5 dots with a line and any point on that line represents a combination of thickness and deflection representing eleven hundred and seventy-seven newtons or 120 kilograms of force my motorcycle

Spoke has a diameter or three point two millimeters this line here represents the 3.2 millimeter motorcycle spoke and the linear nature of the graph so far suggests to me that i can extend that line until it connects with the blue line representing the thickness of the spoke that new point i plotted tells me that that 3.2 millimeter motorcycle spoke should be about

120 kilograms when i have a deflection of 7 millimeters on my 10 g ometer now even if i think my line isn’t perfectly linear and actually slopes up slightly i still get a range on my tent geometers between 7 and 7.5 millimeters of deflection representing a hundred and twenty kilograms of force on the motorcycle spokes i was able to get the spoke tension and really

Quite well balanced out so there was quite a bit of consistency and these two readings here suggest to me that i’m probably in the ballpark so by using the data that i had and making an inference from that i was able to come up with what i think is the right spoke tension for the wheel and even if this is not a hundred percent accurate it’s a lot better than just

Guessing by squeezing the spokes which plainly would not give me any information that really is scientifically valid and then when dave this college professor in arkansas finishes his moped restoration he’ll send me a photo and i’ll be sure to share that with you you

Transcribed from video

Moped Hub Laced to Bicycle Rim With Motorcycle Spokes By Bill Mould