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MTB Power meters?

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quixoticgeek:

I have Shimano XT cranks with 28/38 chain rings. What are my options for power meters that would work with these chainrings? (or chain rings of the same size from other manufacturers? I'd prefer not to go the pedal based power meter route tho.

J

grams:
The spline patterns are the same on most Shimano HT II cranks, even between MTB and road, so if you’re not bothered about aesthetics any left crank power meter will work. There are lots of e.g. Stages 5800/6800 on eBay right now for cheap secondhand.

(You might need to double check Q factor)

bludger:
Here's always the option of a rear hub PM. E.g. https://www.bikeradar.com/reviews/training/power-meters/powertap-g3-hub-review/

It would appeal to me because I'd want my expensive MTB components out of the line of fire from rock gardens, errant tree roots and whatnot. And also you can easily swap it between bikes, lend it to mates, etc.

quixoticgeek:

--- Quote from: bludger on 08 July, 2019, 07:24:30 pm ---Here's always the option of a rear hub PM. E.g. https://www.bikeradar.com/reviews/training/power-meters/powertap-g3-hub-review/

It would appeal to me because I'd want my expensive MTB components out of the line of fire from rock gardens, errant tree roots and whatnot. And also you can easily swap it between bikes, lend it to mates, etc.

--- End quote ---

Hadn't thought about that. Tho it wouldn't allow me to do analysis on my legs individually...

While it's a MTB crankset, and a MTB frame, it's built for Ultra racing with skinny (well 32mm) road tyres, and TT bars. So the rocks/roots thing is less of an issue. I'm using an MTB drive train because I'm not Mariana Vos, and so need lower gears to be able to get up hills. It's an 11/40 cassette and a 28/38 crankset. I was crawling up hills at under 6kph, at 60rpm at the weekend.

J

bludger:
I suppose it wouldn't, but I am surprised that the default always seems to be going for cranks when the hub options seem like a really strong choice. One of my buds rides in a team and has done a cross comparison of a load of crank based PMs and is of the view that actually trying to do microanalysis let alone leg Vs leg using them is a flawed exercise as the data kicked out on one rider across a choice of 3 or 4 products seems to vary enormously.

If you want to do a leg Vs leg analysis you're probably best off using a wattbike or concept 2 bikerg which you might find in a gym IMO.

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