I've been thinking about getting a power meter for a while now. I finally decided I would get one, but now I realise that Stages only starts at the Shimano 105 level.

I currently have a Shimano RS500 Crankset ( 50 x 34 ) and I'm very pleased with it, so I don't feel a need to replace the whole crankset with a 105 5800.

I also have no plans to upgrade anytime soon to Dura Ace or something like that (the rest of my bike has the 105 5800 set), so I don't think I should buy a higher lever crank arm from Stages.

Now, I know something about bikes, but not a lot. It seems that what I have (RS500) looks compatible with the 105 crank arm (just judging by the looks), but I would like to be certain before I spend this amount of money.

My set: http://www.bikester.be/398351.html Stages I would like to get: http://www.powermetershop.de/en/stages-power-meter-shimano-105-5800

Kind regards and thanks in advance,

3 Answers 3


Many individuals are running non matching hollowtech II stages crank arms with no ill effects.

Stages themselves cites this as OK.

Note the Dura-Ace crank below.

Crank Compatibility: All Shimano Hollowtech II road cranks

Go ahead and purchase with confidence and enjoy cycling with power.

I run an Ultegra 6800 Stages on a 6700 Crankset personally.

  • 1
    Went ahead and bought it. Works perfectly! Commented Dec 8, 2015 at 21:18

Interesting topic as I just got a DA 7900 Stages and I'm looking to pair it up with a FC-RS500 crankset as well. Stages say that all Shimano non-drive side crankarms can be mix matched with any Hollowgram II so long it is a Road crankset and not mixed with MTBs (one source say from Tiagra to Dura-Ace and others include Sora). I guess the confusion comes in when the FC-RS500 is a non-series road crank. My FC-RS500 is actually paired up with a Ultegra 6600 non-drive crank I had in spare parts because I'd thought it'd be lighter and stiffer since it was hollow forged all around rather than a milled crankarm. I've ran that set-up on a Shimano external bottom bracket for hundreds of miles without any issues.

As for an unbalance weight, I don't think should be a major issue. When Shimano engineers are designing these cranksets they do take it in consideration as an overall design but I hardly see it as detrimental unless you're spinning 200rpm? Just imo.

  • 1
    Gidday and welcome to SE Bicycles. A good, relevant, on-topic and detailed answer for your first effort. Keep it up and I look forward to your future contributions.
    – Criggie
    Commented Dec 8, 2015 at 21:57

I think you should go ahead and replace the crankset. If you don't, you risk ending up with an unbalanced pair of crank arms (unbalanced by weight, never mind aesthetics).

Here's a picture of your current set:

enter image description here


And here's 105 5800:

enter image description here


Note that while the two look somewhat similar in terms of the crankarm sculpting, the back side of the non-drive arm is certainly not similar. Your RS500 arm has a "trough" running along its backside, which the 105 5800 arm does not have. This trough firstly prevents Stages from being likely to support the RS500, and secondly makes it clear that the engineering of the two arms is not that similar.

  • To say nothing about the different number of arms on the spider.
    – andy256
    Commented Sep 7, 2015 at 13:29
  • @andy256: I assumed the idea here was to use the new Stages non-drive crank arm with the rest of the existing crankset. It hardly matters how many arms the drive side has. Commented Sep 8, 2015 at 0:32
  • I suggest you add that information to your answer. Just imagine someone who doesn't know much about power meter cranks, and is looking into them. The extra info could really help their understanding.
    – andy256
    Commented Sep 8, 2015 at 0:40
  • I run a 4 spider crankarm on a 5 spider crankset with no issues and Stages themselves recommended this combination when 6700 was discontinued. Over 4500km and counting. Commented Dec 7, 2015 at 15:53

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