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The crankset runs US$150.00. It is actually a BMX crankset. But I found it works really well with a double chainring. You can find it at http://speedlineparts.com/products/cranks/sx-mini-cranks/. The design is actually licensed from Answer BMX which has the same crank at http://www.answerbmx.com/AnswerMiniCranks.html.
My scale is dead... I think damaged in the move. I'll have to buy/borrow a new one to get the weight. But it feels close to the mark compared to my bike.
xnavalav8r wrote: It is actually a BMX crankset. But I found it works really well with a double chainring..
Thanks for the links Ted.
So it's intended for use with a single ring ?
How (any particular placing, or modification) did you install the two chainrings on the crank ?
Very clever. I'll copy you, that's for shure
How tall's Ryder again ? Just for crank arm lenghts comparison with my twin daughters...
As for modifications. I made a very minor modification to the spider. Using the Extralite 42/30 chainrings on the 104bcd spider is almost perfect. However, the arms extended a bit further beyond the chainring bolt holes than is normal on a road or mtb crank. As a result, the chain tended to make contact with the arms and "lift" 4 times per rotation. I used a Dremel to grind away a bit of the excess material and shaped the ends of the arms to act as lift ramps when shifting. I'll try and post a detail picture later today. To be honest, I am really impressed with the result. It's not very noticable visually, but it really did improve the shifting. Considering I did it by hand, I can't be more pleased with the result. It was about 10 minutes of effort for a huge performance improvement.
What are KNWU rules for gearing? I mean, with 38 front and 12/13 back you get 6.76/6.24m using 700c/23 wheel. We have max gearing (UCI rules) for kids under 12 -> 5.66m and under 14 -> 6.10m.
My son has felt F95 JR racebike with 650c wheels and 32/38 up front and 13-29 cassette. With this wheel size gearing meters is just under 5.7m (about 5.66m). My son has born 2004 so he is only 9 years old, but he's rather tall 147cm or so.
http://www.pellossalo.fi/content/upload ... G_0573.JPG" onclick="window.open(this.href);return false;
We're using a 38/30 chainring with 14/27 cassette combo. He can run the 14t cog without the chain making contact with the frame. Anything larger and the chain rubs the seatstay. I made the cassette by using cogs from 2 different cassettes. This gives a REALLY low gear if needed (30x27) but maintains the mid-range accomplished by the almost straight block junior cassette without exceeding the rollout limit of 5.78m.
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