Sun Duroc 40 Custom Bicycle Wheel Set


Sun Duroc rims use the same Stan’s BST bead hook, so their tubeless ready profile functions the same as Stan’s rims do, but at a fraction of the cost.

Hub Level/Type Select *

Front Hub Axle *

Rear Hub Axle *

MTB Freehub Options *

For Cassette Compatibility, please visit:

Spoke Options *

Nipples Select *


The Sun Ringle Duroc 40 (36mm inner) is a quality do-it-all wheel set option, that manages to ‘one-up its peers‘ along several metrics. The Sun Duroc series of rims do it all; in short they’re a Rad rim option for anyone looking to build their own set of MTB wheels.  Sun signed up with Stan’s NoTubes to use their BST tubeless rim profile design, but was free to come up with their own rim engineering/profiles.  Thus, while Stan’s MK3’s are sort of “tween” spec, Sun hit the nail on the head with the rest of the marketplace at 27, 30, 32, 35, (and more) inner width profiles.  That, and Sun went on average another millimeter or more taller with their profiles, helping to boost overall rim strength and durability.  Overall, it was a solid approach to creating an extremely competitive rim lineup.  Feel free to analyze rim specs yourself, to better understand the exact details.  So what’s the catch you ask?  Duroc’s aren’t welded like the few top tier rims are.  Is that important?  You make the call.  Do I ask myself a lot of questions?  Hard to say.  Well, can’t you take a guess?  Just know that in the grand scheme of things, by percentage, very few MTB rims have a welded joint.  As a side note, Duroc rims use an external width nomeclature, (whereas most others name their rims based on the inner rim width).  Just to sum it all up, Duroc rims offer a range of widths, are light weight, strong, and they hold up.  Is Airwolf the Raddest 1980’s TV attack helicopter starring Jan-Michael VincentErnest Borgnine, and the guy with the eye patch?  Absolutely.  Not convinced?  Look at where they park the thing!   What were we Musing about?  If you’re into racing (Yeah, That kind of racing), riding hard, or you simply prefer to buy really nice gear, this is your starting and finishing point.  Pretty straight forward.

For the purpose of gaining perspective, let’s talk MTB rims for a moment.  Consider that only a few years ago, top end 26″ disc rims for all mountain riding, with a 21-22mm inner width, used to weigh in anywhere between 500 – 575g.  These Duroc 40’s with a 36mm tubeless ready inner width, in a larger/29er diameter, weigh in at 550g, (our scale).  That’s a radical miracle.  But are Duroc rims tough enuff?.  They’re not going to flex while you’re trying to bomb through a rough patch, or fight you in a tight turn.  It’s a quality rim, offering wheel stiffness without the harsh ride of some carbon options.  Given this rim’s width and strength, it’s an ideal choice for a pretty broad range of riding types.  The Duroc 40’s are an excellent option for larger volume, lower pressure set ups.  If you need traction and you know it, we’d recommend building up a set of these, messing around with your tire pressures to see how low you can go, and you might be able to set new time records for your favorite trail sections, even before you mess around with your shock settings.

Sun Duroc 40 Tubeless Ready Clincher Specs

27.5″ / 29er Front Wheel Rear Wheel Wheel Weights (approx)
Rim Info Sun Duroc 40 aluminum alloy clincher, tubeless ready
ETRTO  584x36mm (27.5″) 622x36mm (29er)
Weight ≈515g average, 27.5″ ≈550g average, 29er
Sidewall N/A
Inner Width 36mm
Outer Width 40mm
Rim Depth 16.5mm
Rim ERD 571, (27.5″) 608, (29er)
Rim Tape Tesa Tubeless Rim Tape Installed ≈ 30 – 35g/wheel (varies based on overlap)
Washers Stainless steel eyelets N/A
Valve Type Presta
Tire Type Standard Clincher with inner tube OR MTB Tubeless
Tire Volumes 27.5″ or 29er x 2.4″ – 3.2″
Nipple Info (Brass) Sapim 12mm Brass Chrome Plated @ ≈ 1g ea 32H = 32
Nipple Info (Alloy) Sapim Alloy Double Square Polyax @ ≈ .34g ea 32H = 10
Spoke Info Leader Sapim Leader 2.0mm Stainless Spokes Black ≈ 6.5g ea 32H = 208
Spoke Info Race Sapim Race 2.0/1.8/2.0 Butted Stainless Spokes Black ≈ 5.65g ea 32H = 180
Spoke Info Dlight Sapim D-Light TCS 2.0/1.65/2.0 Butted Stainless Spokes Black ≈ 5.16g ea 32H = 165g
Spoke Count Front: 32H Rear: 32H
Spoke Pattern Front: 3 Cross Rear: 3 Cross (32H)
Lengths 27.5″ 278/280mm (32H) 276/280 (32H)
Lengths 29er 295/297mm (32H) 293/297 (32H)
Hub Info (option) ST160 ST280
Hub Weight 152g 280g 152g F, 280g R
Hub Shell Aluminum Alloy
Axle Info (option) QR 9mm x 100mm OLD QR 10mm x 135mm OLD
Hole Ct 32H 32H
DriveS PCD
42 61
DS Ctr to Flange 35.5 18
Non-DriveS PCD 42 44
NDS Ctr to Flange 21.5 32
Axle Material Aluminum Alloy
Bearings Sealed Cartridge Japan EZO Bearings
Bearing Size MR17287LLB MR17287LLB
Freehub HG Shimano/Sram “Splined” MTB 8/9/10/11 Speed + Shimano/SRAM Road 8/9/10 speed
Freehub Road 11 Shimano/SRAM Road 11 speed
Freehub MicroSpline Shimano MTB 12 speed
Freehub Sram XD Sram XD 1×11 + 1×12
Freehub Sram XDR Sram XDR 1×12
FH Material Aluminum Alloy
End Caps: Quick Release Front 9mm x 100mm / Quick Release Rear 10mm x 135mm Thru-Axle Front 15mm x 100mm / Thru-Axle Rear 12mm x 142mm **Boost Front 15mm x 110mm / **Boost Rear 12mm x 148mm **Lefty Front Hub

Wheel Weights

(without QR’s or rim tape)

27.5″ ST160/280 – Race w/ Brass F ≈ 892g R ≈ 1012g Set ≈ 1904g
27.5″ ST160/280 – Dlight w/ Alloy F ≈ 845g R ≈ 965g Set ≈ 1810g
27.5″ DT350 – Race w/ Brass F ≈ 897g R ≈ 1032g Set ≈ 1929g
27.5″ DT350 – Dlight w/ Alloy F ≈ 850g R ≈ 985g Set ≈ 1835g
29er ST160/280 – Race w/ Brass F ≈ 927g R ≈ 1047g Set ≈ 1974g
29er ST160/280 – Dlight w/ Alloy F ≈ 880g R ≈ 1000g Set ≈ 1880g
29er DT350 – Race w/ Brass F ≈ 932g R ≈ 1067g Set ≈ 1999g
29er DT350 – Dlight w/ Alloy F ≈ 885g R ≈ 1020g Set ≈ 1905g

What Others Are Saying…

You have the choice to build these wheels with ST160/ST280 MTB hubs or go all out with DT Swiss 350 disc hubs featuring the DT Swiss Star Ratchet engagement mechanism.  Both are great options.  The Speed Tuned Super 6 2.0 hubs feature 36 points of engagement, (10 degrees) via a 4×2 pawl freehub.  The drive ring and pawls are overbuilt in terms of diameter, (drive ring), height, (drive ring + pawls), and materials, (quality stainless).  Their bearing placement is proper, in terms of overall design meant to promote hub function and durability.

DT Swiss 350 hubs are excellent, they are finished to incredible standards, and include DT Swiss’ Star Ratchet engagement system, (same exact drive mechanism as with their DT 240’s and 180’s).  These hubs get the job done, hold up extremely well in an assortment of conditions, and have proven reliable even in the emerging context of high torque drive trains, (29er wheel bikes with 1×12 Eagle drive trains).  Essentially, DT 350’s offer you the option of buying one of the best-performing hubs available anywhere, for only a modest price bump.  Given their huge value proposition, they are hands down a great option for any MTB rider that cares about their gear.

In “stock” form, these wheels are built with Sapim Race Double Butted 2.0/1.8/2.0 black spokes in a 32 hole, three cross configuration front, and rear.  Sapim Race spokes offer legendary quality and performance.  If you didn’t know a thing about spokes, know that your wheels would come with a really top-notch spoke product.  That being said, we’re offering a spoke upgrade option, in the form of Sapim DLight 2.0/1.65/2.0 spokes.  There are two great spoke manufacturers in the world, DT Swiss and Sapim, (in alphabetical order).  Essentially, you might be able to find a spoke product that approaches their quality, but you’d be hard-pressed to find a company that makes a better spoke product than these two.  All their spoke products, from straight gauge to their elliptically bladed and butted products, are all the best of the best.  Sapim Dlight spokes will perform at the same relative level as Sapim Race or DT Competition spokes but will shave off approximately 75 – 80g from the wheelset.

The Sun Duroc 40 is a stellar wheelset option, in a field that’s composed of some of the best aluminum alloy MTB rims ever.  Given their level of performance, they are an unbeatable deal, (coupon codes here).  We’re not joking around here.  If you don’t have a lot of time to research all the rim options in the marketplace, if you don’t have a lot of money, and if you can find this product page, maybe that’s Magic.

Should you buy this wheelset?  Entirely your call.  Should you watch this short but sweet rock climbing video?  Absolutely.  One More Fun One.

Make That Two.

Wheelset Facts

    • Comes with tubeless tape & valves installed.
    • The Sun Duroc 40 (sleeved joint), has a 36mm inner width, is 16.5mm tall, 40mm wide, and weighs about 515g (27.5″) or 550g (29er)
    • Recommended for use with 27.5″, 29er x 2.4″ – 3.2″ tires
    • Sun Duroc rims use Stan’s BST bead seat tech as their tubeless ready profile, so they work the same as Stan’s rims do.
    • These rims have single stainless eyelets.
    • Wheelset weight will vary with end caps, freehub driver, and nipple selection.  Tape + Valves adds approximately 35g for the wheelset, on average.

Additional information

Weight 7 lbs
Dimensions 30 × 7 × 26 in


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