Stan’s MK4 and S2 alloy rims roll out with new M-Pulse and E-Sync hubsets

Stan's MK4 and S2 alloy rims roll out with new M-Pulse and E-Sync hubsets

Stan’s have launched new MK4 and S2 asymmetrical and symmetrical aluminium rims throughout their widespread Crest, Arch and Circulation fashions. This assortment of welded and sleeved rims with 25mm, 28mm and 30mm inner widths supply gravel, cross-country, enduro and downhill riders an affordable alternative of worth factors to swimsuit most budgets.

Right here we talk about the primary variations between the dearer MK4 and cheaper S2 choices. First… Reed Boggs driving the brand new Circulation MK4 rims in Virgin, Utah.

Stan’s MK4 and S2 Rims

stans flow mk4 wheelset with 2021 m-pulse hub
The Stan’s Circulation MK4 uneven alloy rim laced to the as-of-yet unreleased 2021 M-Pulse hub

Stan’s have launched six new wheelsets for off-road driving; Crest MK4, Crest S2, Arch MK4, Arch S2, Circulation MK4 and Circulation S2. The Crest mannequin caters to the gravel and XC contingent, with a 25mm inner width rim seating gravel tires from 40mm to 2.3″ MTB tires. Arch are wider at 28mm, catering to path riders operating 2.2″ to 2.5″ tires. Circulation have a 30mm inner width rim, capable of accommodate tires from 2.3″ to 2.6″, pleasing the enduro and downhill crowd.

Every of those fashions can be found within the MK4 or S2 rim design. Each are aluminium, however the MK4 is nearly twice the worth of the S2. So, what are the variations right here?

stans flow s2 symmetric rim
Stan’s Circulation S2 aluminium rim with a symmetrical rim mattress and 30mm inner width

It’s all all the way down to the rim’s fabrication course of, and the form of the rim mattress itself. The S2 rims are Stan’s symmetrical aluminium rims. The spokes aren’t offset of centre, and there’s equal area on both aspect of the rim valley to the sting. They’re manufactured with 6061 aluminum utilizing a sturdy sleeved joint and chrome steel rim eyelets.

stans flow mk4 alloy rim
Stan’s Circulation MK4 rim with asymmetrical rim mattress and 3mm offset spoke gap drilling

The MK4 rim, however, is manufactured from 6069 aluminium, which has a better tensile and fatigue energy than 6061. They’re fabricated with a welded seam, and have a bolstered spoke mattress and partitions with a matte-blasted end. These rims function an uneven profile mentioned to lead to a extra dent-resistant rim.

The spoke gap drilling is offset of centre, too. The gap of offset depends on the rim in query; for Crest it’s 1.5mm, for Arch it’s 2.5mm and for Circulation it’s 3mm. The asymmetry of those rims imply that Stan’s can enhance the spoke bracing angle and obtain an virtually equal spoke rigidity between the drive- and non drive-sides. 

Stan's Crest MK4 Gravel XC rim
Stan’s Crest MK4 uneven rim for Gravel and XC has a 25mm inner width and 1.5mm offset spoke gap drilling

The Crest MK4 uneven rim, as an illustration, has a 92% stability between the drive aspect and non-drive aspect spoke rigidity, versus the 58% spoke rigidity stability of earlier symmetric Crest MK3 rims. That is mentioned to provide rise to a stronger total wheel construct.

The MK4 rims are Stan’s first-ever uneven aluminium rims, developed from their proprietary asymmetric-Bead Socket Know-how we noticed beforehand on their Flow and Baron CB7 carbon rims.

What in regards to the wheelsets?

stans arch mk4 wheelset
The Stan’s Arch MK4 alloy wheelset with a 28mm inner width for path driving

These aren’t standalone rims that clients might want to lace themselves. The Stan’s MK4 rims and Stan’s S2 rims can be out there as full wheelsets, laced to new M-Pulse and E-Sync hubsets, respectively.

stans arch s2 wheel e-sync hub

The brand new E-Sync hub is Stan’s eMTB-specific hub, designed to resist the larger torque related to a motor-assisted drivetrain. The truth is, they’ve a 47% enhance in max torque load capability over Stan’s earlier Neo hubs. Strengthened pawls that distribute stress away from bearings, chromoly axles, Enduro bearings, together with a double row bearing within the freehub, are all mentioned to contribute to the elevated sturdiness.

stans crest s2 alloy wheelset e-gravel riding e-sync hubset
The Stan’s Crest S2 is an aluminium e-gravel bike wheelset appropriate for 40mm tires

Freehub engagement is pretty middle-of-the-road for the E-Sync, at 8.18° with all pawls participating concurrently for dependable engagement below excessive masses. No close-up pictures of it simply but.

stans 2021 m-pulse hub
A poor high quality close-up of the 2021 M-Pulse hub from Stan’s No Tubes…

The upper-end MK4 rims can be laced to a brand new M-Pulse design that can be shared with all of Stan’s high-performance aluminum and carbon wheels. Particulars are non-existent at this cut-off date. Stan’s web site tells us this:

“The M-pulse is a wholly new hub design not like something we’ve executed earlier than. It’s presently busy exceeding each take a look at we will throw at it and blowing us away with how fast and constructive it engages and the way easy it rolls” – Stan’s No Tubes.

Claimed Weights

The opposite issue contributing to the numerous worth distinction between these two aluminium rim designs is the load. Whereas the MK4 rims are made out of a higher-quality aluminium with the uneven rim profile leading to a stronger total wheel construct, the edges themselves are additionally considerably lighter than the S2 counterparts.

29″ Rims Crest Arch Circulation
S2 457g 520g 583g
MK4 399g 481g 521g

Pricing & Availability

stans crest s2 gravek wheelset 40mm tires

Whereas you will note the Stan’s S2 wheelsets spec’d on full bikes, they may also be out there aftermarket at $595 USD with a three-year guarantee on the E-Sync hubs and a two-year guarantee on the S2 rims. These can be out there with Shimano Micro Spline, HG, or SRAM XDR freehubs, and 6-bolt or Heart-lock brake type, with choices to suit all widespread axle configurations.

stans flow mk4 alloy wheel front

The Stan’s MK4 rims retail at $129 USD. Full wheelsets with the brand new M-Pulse hubs will retail at $925 USD. These aren’t out there simply now, because the M-Pulse hubs received’t be launched till late 2021. They are going to be out there for Shimano Micro Spline and HG in addition to SRAM XDR cassettes and provided in all frequent axle sizes.

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