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I wonder if anyone knows of a 29er frame that has clearance for at least 2.5 tires that will take a compact (50/34) road crankset? Preferably steel.

  • Just asking, but why would you put a road crankset on MTB? Are gear gaps too big with 1x? – Klaster_1 Dec 23 '18 at 12:13
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    Another option is to get 5-arm road spider for direct mount crankset (SRAM or RaceFace). Big chainring clearance might still be an issue, but should it really be 50t? With 2.5" 29 tires 45/46t are the equivalent of 50t with 25mm tire. Also, the chainline might be off. – Klaster_1 Dec 23 '18 at 12:31
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    Sram 12 speed Eagle has a 10-50 cassette, giving same gear range 50-34 with a 11-36 cassette. 50/10 on 2.5" 29er is a big gear, can you honestly and practically make use of (aero effects mean pedaling at that speed is wasteful, better to tuck in and conserve energy for the uphill.) – mattnz Dec 24 '18 at 0:58
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    50-11 at 90 rpm on a 29er is about 35 mph. If your goal is to get somewhere, you'd do much better just getting into an aerodynamic tuck and not pedaling. Seriously. You will go faster down a hill like that in the most aerodynamic position you can get than you would if you got into a less aerodynamic position and pedal. Because down hills like that, you're probably getting something about 2,000W of power from gravity. At those speeds, "2000W and aero" is faster than "2300W and non-aero". If you're on a training ride and need to keep pedaling for that reason, don't ride hills like that. – Andrew Henle Dec 24 '18 at 14:12
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    @Andrew Henle Do you mean like this..youtube.com/watch?v=3Iz7ZMALaCY – mattnz Dec 25 '18 at 0:25
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Thanks everyone for your contributions! Some were actually really helpful, some not so much lol; thanks anyway for taking your time to post.

So, to summarise, there isn't a 29er frame that will take a compact road crankset, or at least people don't know about it. However there are workarounds which will ALMOST achieve my desired result. Thanks everyone!

P.S. I'll update this post if I find a frame like that, I wouldn't bet on it coz of clearance + chainline issues

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