Stan’s Flow EX 650B Wheelset – First Look

27.5 Wheels

The new Flow EX rims were created for All Mountain and light Freeride usage, and their additional strength and width should be good for the rigors of just about anything tossed at them. The design is a beefed-up version of its Flow brethren, and it has gotten 14% thicker sidewalls and 33% thicker spoke bed, and the bead socket has been altered for a tighter and more dependable seal.

The inner width has been bumped from 22.6mm to 25.5mm, while the outer went from 28mm to 29.1mm, which should offer a wider footprint, and spread the tire’s girth and tread out for a more stable platform. The weight is still respectable for a wide rim, and the 26 inch comes in at 490 grams, the 650B at 530 grams, and the 29er at 545 grams, and they’ll retail for $90 to $96 depending on size. They are also available as custom built wheelsets using various hubs, including Stan’s 3.30, Hope Pro 2, Cannondale Lefty and DT Swiss 240, and will range in price from $500 – $950.

NOTE: Due to demand the 650B are not available until August 1st!

Stan’s sent along a set of their 650B wheels for us to test, and we’re looking forward to some long term testing on these babies! The build uses the Stan’s 3.30HD front hub with a 20mm thru axle, and has adapters for 15mm or 20mm usage, and the rear was Stan’s 3.30 in a 12x142mm thru axle set up. The weight was a bit on the heavy side compared to some other All Mountain wheels, but it’s still respectable, and I think the 3.30HD front hub is what adds the extra poundage, albeit, it’s a big meaty and robust beast.

Flow EX Measured Specs:

  • Front 20mm TA (w/ tape & valve) – 898.1 grams
  • Rear 12×142 TA (w/tape & valve) – 981.7 grams
  • Total – 1879.8 grams
About the author: Brian Mullin

Brian has been part of the Mtbr team since 2007, where he has become an integral member of the review and test staff, specializing in technical articles. He likes to push the limits in all the sports he obsesses in, whether it's mountain biking, whitewater kayaking, extreme skiing, or sport climbing. He takes those same strengths and a good dose of insanity to his reviewing and writing on mountain biking products, creating technical, in-depth and hyperbolic articles. Whenever he's not on the bike, he might be found watching MotoGP racing, otherwise look for him out on extremely technical singletrack.


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