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FB17: Sun Ringle rolls out Duroc rims in new 30 & 35mm sizes

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Not far behind tires, the variety of rim widths is ever increasing. Slowly growing year after year, eventually they hit a point where they may have gotten too wide. Depending on the tire you’re using, that 40 or 50mm rim might actually be hurting the performance of your tire rather than helping it.

That’s why brands like Sun Ringle are filling out their lines with more options like the new Duroc 30 and 35s. And since they’re available in both 27.5 an 29″ versions, they’ll serve as great additions to a lot of bikes as durable, tubeless upgrades…

Similar to the other models in the Duroc line, the 30 and 35 use a double walled, welded rim that uses the Sun Ringle Tubeless Ready profile.

Labeled as 30 and 35, the internal widths come in at 27mm and 32mm respectively. Complete wheelsets are offered in both widths in 27.5 and 29″ sizes, each with 28 Wheelsmith straight pull DB14 spokes and brass nipples. Rim will also be available and in 28 or 32 spoke versions. The Sun Ringle SRX hubs are listed as Boost only for the front, while the rear has options for 135 QR, Boost or non Boost thru axles.

Prices are set at $129.99 for each rim, $239.99 for the front wheel, and $359.99 for the rear. As usual, wheels include tape, bottles of sealant, tubeless valves, hub adapters, and even XD drivers.

Hayes also had a new cutaway in the Manitou booth of one of their forks. In addition to showcasing some serious machining skills to cut windows into all of the tiny components, it also highlights their MRD IRT kit which is available as an upgrade for Mattocs and Dorados. The Infinite Rate Tune creates a secondary air pocket above the floating piston (top right) which can be tuned to alter the mid stroke of the fork independent of the bottom out. Looking at the internals of the air chamber (left leg, right side in the photo above), the negative chamber sits below the bottom white piston, the positive chamber lies in the middle, and the IRT chamber is at the top. Check out more on the IRT system here.


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6 years ago

I used it for xc riding at first running fairly high air pressure (high 20’s to low 30’s psi) and on a bump where the rear rim barely touched the ground, it dented. 150 miles after purchasing bike, the rim was worn out. If it’s an Enduro wheel, how come it dented under only aggressive xc use with a 125 lb rider? It’s only good for standard xc use. Anything more it’ll likely dent. To add to it, yesterday probably 600 miles in, the front wheel took a hard hit with high 20’s psi, which barely damaged my tire but destroyed the rim (cracked on one side). I wouldn’t exactly say the sidewalls of my tire is very heavy duty (magic Mary snakeskin soft) and with the hit it took yesterday, it should have cut the tire and only slightly dented the rim.

I won’t get into details, but the rear hubs don’t feel well built either. I could be wrong, but personally I don’t dare use it for the long haul.

To be fair, I get that impacts aren’t good, but my 8 yr old 26″ budget fs bike (keeping in mind aluminum degrades) took some insanely hard impacts without denting. Also I can point out my current rear rim (stans arch mk3) isn’t exactly the toughest rim on the market and that’s taken much harder hits during the last 450+ miles under Enduro use than my original duroc rear rim had (including 1 cut tire) and not a single dent.

Sunringle (Hayes) customer service was a joke when trying to warranty the rear 150 mile new stock rim used for heavy xc (trail (not enduro)) riding. He basically said I was running the wrong pressure and riding too hard (as if I’m dumb) and how he could show me their mathematical equations for how a rim is designed. The truth is as I learned in school, the bottom line is if a product doesn’t fit customer’s needs, it’s not a good product. Math is only a starting point to determine product specifications/strengths.

BOTTOM LINE: the duroc is crap. Only strong enough nothing over standard xc more than cross country use and their customer service won’t stand behind their claim or warranty their products. A safer bet is to shop for a brand who will offer some sort of support whether or not the damage is your fault.

My buddy for example, cracked a carbon rim due to low air pressure and that manufacturer is still offering a replacement hoop.

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