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Once the New User Registration is completed, the system will recognize the applicant’s email address the next time they attempt to apply or re-access their application. The new Flow MK4 rims have an asymmetric profile, which makes it possible to use the same spoke length for the entire wheelset, eliminating the need to have multiple spoke lengths on hand just in case. Those 32-hole rims are constructed from 6069 aluminum, with a welded joint and a reinforced spoke bed. They're laced up to the hubs with a three-cross pattern using Sapim D-Light spokes and alloy nipples. I prefer brass nipples over alloy, since they're less like to round out during truing, but they're not as common on pre-built wheelsets these days. The internal rim width is 30mm, a number that's pretty much become the norm for trail and enduro wheels, since it works well with tire widths from 2.3” to 2.6”. What makes the new hub stand out is the use of magnets on each pawl. Small circular neodymium magnets pull the 6 pawls upwards into the drive ring, a design that Stan's says provides better engagement with less drag. And yes, it's based on Project 321's design – the Oregon-based company manufactures the freehubs for Stan's. Personally, I'm a huge fan of the fact there aren't any miniature springs underneath each pawl, since those seem to pop off and bounce into the darkest recesses of my shop exactly when I don't want them to. The 6 pawls are oriented so that two at a time engage with the 72 tooth drive ring, which equates to 216 points of engagement, or 1.7-degrees of rotation between engagment. In other words, there's minimal crank rotation to engage the hub. It's not as quick as I9's Hydra hubs, which only have. 52-degrees between engagement points, but it's not far off, and is up there as one of the quickest engaging hubs on the market. This wheelset saw action in the wettest and the driest parts of the year here in Washington, so it's been exposed to the full gamut of mud puddles and moon dust. For the majority of the test period is was on a Stumpjumper EVO alloy, with a Maxxis DHR II DoubleDown rear tire and an EXO+ Assegai front and no inserts. My typical pressures were around 21 psi in the front and 23 in the rear, changing slightly depending on conditions.

Tire installation was a breeze, and everything popped into place without any fuss. I've reviewed several different iterations of the Flow wheels over the years, and every time 'neutral' is the word that I end up using to describe the ride feel. They're not crazy soft or crazy stiff, which makes them one of those wheelsets that doesn't dramatically the ride feel of a bike. Now, 'middle-of-the-road' may not be a marketer's dream product description, but when it comes to wheels that's a good place to be. Suspension and meaty tires do a lot to disguise wheel attributes, and it takes something dramatically different to deliver a tangible difference. Still, I could notice the slightly softer ride quality of these wheels compared to the carbon WTB CZR wheels I'd had on previously. Aluminum wheels tend to have a slightly more damped quality than stiffer (and more expensive) carbon options, and that was certainly the case here. There wasn't any harshness, and they were nice and comfortable on chunky, brake-bump filled trails. This time around, it's really the hubs that are the main talking point.

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