Originally Posted by
paulie.reklama
Thanks for sharing your experience, my cranks are compatible with 68 and 70mm bottom bracket widths. I have a 68mm width, so I hope that 2mm of shimmy is within the product tolerance without negatively affecting the stability of the left crank arm mount. I looked at the road cranks offer, I couldn't find anything with a Q-factor higher than 150mm, only a road triple speed chainring (e.g. Sora FC-R3030-CG with a Q-factor of 158.8mm), but since I want a single chainring up front, it doesn't make much sense to convert it.
For MTB cranks, there is an offer for example Deore MT5100 with a Q-factor of 178.5mm, which is quite a big jump. This one would probably be more reasonable in terms of price, but it only has a BCD of 96mm, it's hard to find large 50T road chainrings at a normal price.
Yes, spindle designed for 68 or 70mm, used on 68, should give you at least 2mm to play with.
For my 2X conversion (from 1X), I'm a retrogrouch in wanting a 5 arm spider, symmetrical, not proprietary BCD. I found a generic hollow spindle road crank, 5x110mm BCD in 50/34, so could easily go larger on the big ring, 5x110mm BCD was a common touring bike crank, often with a 5x74mm BCD inner pattern for the low ring on a triple. Mine looks like this:
Was dirt cheap, $60 for crank with rings and external BB bearings, 3 years ago on amazon. I've been tickled with it. Also available with aluminum rings only a few bucks more; Mine was advertised as aluminum, came with steel rings, I told seller as much, they mailed me aluminum rings, just took a month from China.