I have the knight tensioner and it works perfectly on my black betty, which im sure has no bigger drops than the riot. Looks like hoffman makes one that probably works just as well for cheaper. I also have 14mm drops, but i believe you can use a 3/8" to 14mm peg adapter to make a 14mm tensioner work with a 3/8" axle. Hope that made sense..
edit: most track frames have longer drops, so im not sure if those track specific tensioners would be short enough.
One of my friends uses the Knight Gumdrops on his Majesty, which has insanely short stays. He has them on all of his bikes, which also speaks to their performance.
i've used Knight tensioner on a few of my bikes, however, when i was just trying to install it on my latest build, the whole thread came out of the knight, making it useless...
i have used it for a few years, but was still a bit shocked at that....
I bought a Knight gumdrop for my 09 Mob. The Knight 3/8" version is actually too small for my Hadley hub bolts. I would have drilled it out to fit the bolt, but the back piece of the tensioner also didn't fit the width of the dropouts. I think it is designed for 5mm dropout size; I thought the Mob had pretty thin dropouts, but I guess they are 6mm.
I may be selling the 3/8" Gum-drop, if anyone's interested.
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