Longterm Review | 12 months on the Santa Cruz Reserve 27 carbon 29er wheelset

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It’s been two years since Santa Cruz announced it would be developing its own carbon fibre mountain bike wheels.

Coming under the ‘Reserve’ label, the carbon wheel range hosts a range of width options in 27.5in and 29in sizes, ranging from lightweight 25mm wide XC rims through to 37mm wide plus-compatible rims. More recently, Santa Cruz has added DH and gravel-specific rims too.

santa cruz reserve 27 carbon rim valve
Santa Cruz jumped into the carbon wheel game nearly two years ago.

Santa Cruz Reserve Carbon Rims

The carbon rims are completely unique to Santa Cruz, and feature thick, tubeless ready hookless beads along with externally reinforced spoke holes for strength.

Perhaps the biggest headline from the launch though was when Santa Cruz announced the rims would be coming with a lifetime warranty for the original owner – something that’s sent other brands scrambling to step up their own warranty and crash-replacement programs.

Oh, and there was that viral video of Danny Mackaskill destroying a set of wheels that probably helped the launch too.

santa cruz reserve carbon rim
The Reserve rims feature 3mm thick carbon hookless beads and an asymmetric profile.
santa cruz reserve rim cutaway carbon fibre
Santa Cruz’ carbon fibre rims feature thicker walls around the drilled spoke holes.

California Buildin’

The rims are then used to build into complete wheelsets, which Santa Cruz offers as a spec option on its complete bikes, and also sells separately too. The wheels are built in the company’s California factory, using standard J-bend DT Swiss spokes, Sapim mechanical-locking nipples, and your choice of DT Swiss 350 hubs, Industry Nine Torch hubs, or Chris King ISO hubs.

I’ve been riding a set of Reserve 27 wheels for about 12 months now. If you’ve followed the story, you’ll know that I actually built these up last year during a visit to the Santa Cruz factory in California, where they build all their complete wheels. Before you worry about the structural integrity of my test wheels, bear in mind that I did have a little bit of help.

santa cruz reserve 27 carbon rim
The Reserve 27 is a trail-oriented wheelset with a 27mm internal rim width.

Sitting between the XC-oriented Reserve 25 and the enduro-ready Reserve 30, the Reserve 27 features a 27mm internal rim width that Santa Cruz says is best suited for tyres anywhere between 2.0-2.5in wide. I’ve mostly fitted 2.3in tyres to my longterm test wheelset, which has included Bontrager XR5 Team Issues, Specialized Ground Control & Fast Traks, and Maxxis Minion DHF/DHR IIs.

Santa Cruz Reserve 27 Carbon Wheel Specifications

  • Carbon fibre construction
  • Tubeless compatible hookless rim profile with reinforced spoke holes
  • External width: 34mm
  • Internal width: 27mm
  • Rim depth: 25mm
  • Claimed rim weight: 455g
  • DT Swiss 350 hubs, 110x15mm front & 148x12mm rear
  • Star Ratchet freehub mechanism w/36 points of engagement
  • 28x DT Swiss Competition Race (2.0-1.6mm) J-bend spokes
  • 3-cross spoke lacing
  • Sapim 18mm Square Drive Secure Lock nipples
  • Available in 27.5in & 29in diameters
  • Actual weight: 1750g (29in size, Boost hubs)
  • Lifetime warranty
  • RRP: £1,599 / $2,848 AUD
dt swiss 350 hub
DT Swiss 350 hubs are the cheapest spec option, but their performance leaves very little to be desired.

The Build

Our test wheelset is rolling on DT Swiss 350 hubs, which are a nice solid choice that feature sealed cartridge bearings, a 6-bolt rotor interface, and simple press-fit end caps. The rear hub can be interchanged between SRAM XD, Shimano HG and Shimano Microspline bodies.

Since our test wheelset has been bolted onto a Santa Cruz Blur, the hubs are spaced for a Boost fork (110x15mm) and Boost dropouts (148x12mm). And to accommodate the SRAM X01 Eagle drivetrain, we’ve got an XD driver on the rear hub. In addition to the Blur, I’ve also tested these wheels on the Canyon Neuron CF, Giant Trance 29, and Merida One-Twenty that I’ve also been reviewing.

The iconic Star Ratchet freehub mechanism lives inside the rear hub, though instead of the standard 18t drive rings, Santa Cruz specs the faster-engaging 36t ratchets, which deliver 10° of engagement. If you want more clicks than that, you could always buy the 52t ratchet kit to speed up engagement further.

dt swiss star ratchet freehub
Santa Cruz has upgraded the Star Ratchet mechanism to the 36t ratchets.
dt swiss star ratchet freehub
Since the end caps are removable without tools, servicing couldn’t be simpler.

Performance from the DT Swiss hubs has been absolutely faultless. No creaks, no movement, no nuttin’. That hasn’t surprised me in the least though – I’ve ridden loads of DT Swiss hubs over the years and have never had an issue.

Servicing the Star Ratchet freehub system is also about as easy as it gets (check out this video to see how easy it is to pull apart and reassemble). They’re still rolling smooth, so I’m a while away from needing to source fresh cartridge bearings.

dt swiss freehub cassette
The tool-free end cap does mean the cassette can occasionally pull the freehub off the axle if you knock the wheel while it’s out of the bike.
santa cruz reserve 27 carbon rim
Bumpy carbon rims.

Developing The Reserve Rims

Rather than just re-badge an open-mould carbon rim, Santa Cruz went through a significant development period to come up with its own unique shape for the Reserve rims. To do so, the company invested in a new R&D facility within its Californian factory, which is solely dedicated to composites development and prototyping. It’s the same place where that Danny MacAskill carbon fibre trials bike was made.

During intensive fatigue and destruction testing of competitors rims, Santa Cruz’ engineers discovered that aside from cracking at the bead, wheels were also failing at the spoke holes, where the nipples were actually being pulled through the rim under extremely high stress.

santa cruz reserve carbon rim
You can notice the much thicker carbon fibre walls around the top of the rim where the drilled spoke hole is.

To address this issue, Santa Cruz’s in-house carbon fibre boffins started building prototype rims with much thicker material around each of the spoke holes. This greatly improved strength, to the point where they were finding that spokes were breaking on the torture machine long before the rim gave way.

To deliver this increased strength without adding too much weight, the rims only feature a concentrated reinforcement around each of the spoke holes. This is why the rims have a bumpy exterior – those bumps are the built-up layers of carbon. This differs to the Giant TRX carbon wheels that place the thicker bumps on the inside of the rim.

santa cruz reserve 27 carbon rim
The rims are tubeless compatible and get 3mm thick hookless carbon beads.

On The Trail

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Review Info

Brand:Santa Cruz
Product:Reserve 27
From:santacruzbicycles.com
Price:£1,599 / $2,848 AUD
Tested:by Wil Barrett for 12 months

Comments (4)

    100% agree. I’ve had the same wheels for just over a year. They’ve been on a Hightower, Pace RC529 and my Scott Spark. It’s a testament to how versatile they are I suppose.

    Just because of these wheels, I’ll always have a 29er hanging about 🙂

    Hi Wil, nice review. Can you compare SC Reserves with Reynolds TR 309 that are stock on Canyon Neuron CF you tested recently. Thanks a lot. Martin

    @muller.mm – Good question! In comparison, the Reynolds TR 309 wheels have a 30mm internal rim width, so I reckon you’d be better off comparing those with the Reserve 30 wheels, rather than the skinnier Reserve 27s I’ve tested here.

    Rim width aside, the wheels share some pretty similar specs. They’re both built with 28 spokes front and rear, though the Reynolds hoops do use straight-pull spokes. The TR 309 wheelset is also built around Reynolds’ own alloy hubs, which get a 4-pawl freehub mechanism with 36 points of engagement. I didn’t have any issues with the hubs on the Canyon Neuron CF 9.0 SL test bike, but when it comes to longterm durability, it’s pretty hard to go past the DT Swiss 350 hubs that come on the Reserve wheels.

    Strength wise, I gave the Reynolds wheels a hard time and the rims didn’t flinch. I actually wrote-off a rear tyre after slicing it open pretty bad on some gnarly imbedded rocks. They shrugged off that impact and many others during the couple of months I had that bike for, so I reckon they’re plenty strong enough.

    In terms of stiffness, the Reynolds TR 309 wheels were pretty solid. I didn’t have a chance to B2B test them with the Reserves, but even still, I wouldn’t say there’s a huge difference between the two wheelsets when it comes to compliance. They’re both stiff and responsive carbon wheelsets.

    The Reynolds TR 309 wheels do come out heavier at 1803g for the pair, compared with 1750g for the Reserve 27s tested here. As I mentioned above, you’re probably better off comparing the Reynolds hoops with the Reserve 30 wheelset, which according to Santa Cruz, weighs 1831g for the pair. Either way, there isn’t a massive difference.

    Hope that helps!

    ST Wil.

    I’ll stick to my HUNT thanks, 3 degree engagement, Sams weight and £350!

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