Frustratingly limited options for one of my niche bikes...!
It is a Condor touring bike. It is steel and very classic looking. I use SPD shoes, it runs 650b wheels with discs and has a BSA bottom bracket. This seems to strike out all pedal based options. I have a super low 44-28 classic Rene Herse style crankset so no crank arm options either. The wheels are built with Grand Bois 32 hole rims with a Son Delux dynamo up front and a polished silver finish.
The reason I want power on this bike is that I do long multi day rides and want to a) keep better track of fatigue and b) pace myself better as when loaded up it is very easy to go a bit too hard as the pace is lower.
Only options I can think are either:
1. Powertap disc hub (https://www.powertap.com/product/powertap-disc-hub
) which seems fairly sensible as I will only ever be using those wheels on that bike and with it being discs the rims won't be wearing out anytime soon. Also I'd get to keep the awesome looking crankset. The hub is heavy but then so is the bike so again not an issue. Downsides seem to be that a) it is ugly and won't match the rest of the bike and b) the disc brake rim appears to be proprietary which probably isn't a big issue but could be on a random adventure somewhere. Other positive is that I use a Powertap on my main training bike so would be consistent.
2. Hope that FSA extends its Powerbox range to its new sub compact sets. Would be fine with 46-30. (Ugly though, more so than a hub).
3. Are there any existing 'sub-compact' sets out there that can take a crank arm power meter like Stages/4iii that work with BSA bottom brackets? Alternatively it looks like Rotor's new No Q direct mount chain ring matched to one of their power meters is one option (http://www.velotechservices.co.uk/shop/ ... 49&cat=373
). I am slightly confused as to which crankset I'd pair it with though.
Again generally ugly/doesn't fit classic looks.
Frustrating that nobody does an SPD pedal based power meter (not everybody using SPDs is smashing them into rocks all day long!).
Any suggestions very welcome.