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Found 3 results

  1. Smoother

    The Tyre (Tire) Thread

    The topic of tyre swapping and alternatives comes up more frequently these days. So I cut this from another thread. It's a tiny bit messy, but a lot of questions are answered by the data. Here's what my research has pulled up. Most of us know by now that bicycle tyres/tires are specified by the total diameter of the tyre, not the rim it fits on, as per the rest of the tyre world. So for example a 14" EUC actually has a 10" rim. However things get complicated with machines like the Gotway Nikola which is a 17" wheel, not because the rim is bigger, but because the tyre on it is actually just a fat 16" that measures 17" across. To be clear, it still fits on a standard 16" EUC rim (except maybe the rime is thicker from left to right, I don't know, Ecodrift measured the motor windings of the Nikola at 3cm, but I just measured the motor winding on my 3 year old KS14C. Guess what! 3cm. But I have it on good authority the manufacturers do not has the same motor suppliers) Right, so, here's the skinny: Most tyres have the actual rim size and width (distance between the rims across the tyre from side to side, often wider than the rim) in mm, stamped on the sidewall So: If you want a tyre for your 14" wheel look for a tyre with yy-254 where "yy" equals the width (yy details below) e.g.47-254, 57-354, 64-354, 76-254 and 254 = a 10" rim If you want a tyre for your 16" wheel look for a tyre with yy-305 e.g. 57-305, 64-305, 76-305. 305 = a 12"rim If you want a tyre for your 18" wheel look for a tyre with yy-355 e.g. 64-355, 76-355. 355 = a 14" rim If you want a tyre for your 22" wheel look for a tyre with yy-489 e.g. 64-489, 76-489. 489 = a 19.25"rim (not sure if that exists) So in theory even a 17" tyre will display 305 on the sidewall, because the size of the rim hasn't changed. "yy" chart 47mm = 1.75" 57mm = 2.125" 64mm = 2.5" (actually its 63.5mm but my 2.5" tyre says 64, so I assume they all round up) 76 or 77 = 3" For example, If you're looking for a tyre for your 16" wheel anything with a secondary sizing designation of yy-305 will fit. However too skinny or too fat could cause problems, both with your rim fitment, and possibly the area in the wheel cavity within the EUC itself. I hope this helps, and remember, my advice is worth what you paid for it, so verify my finding before plunking down your Sheckles for a shiny new tyre from across the seas. And don't forget to consider your inner tube issues.
  2. electricpen

    Bent rim

    So I had an unfortunate visit with the pavement today and the crack I hit was big enough and I was going fast enough that I have bent the rim on the wheel. It has a rhythmic thumping feel now as I ride around although it is probably not audible to others. I can just feel it as I ride. Does anyone know: 1) How hard it is to fix this? 2) How dangerous it is to ride on it like this? Maybe this just means I need to buy a new wheel???
  3. Jonathan Tolhurst

    My Osteoporotic Wheel - Rim Fracture

    Not sure if anyone has had this happen before - part of the rim of my E+ fractured off when attempting to do a 360 degree hop off of the side of a 40 cm box. I didn't land quite straight and the rim just gave way as I landed - completely my own fault. I knew I had eaten a little too much over the festive season but thought I'd of worked it off by now I still have the motor from my old E+ so will try to reuse that, otherwise i'll need to try and source a replacement. Does anyone know if you can separate the motor from the wheel rim or is it a sealed unit?
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