By Mark Wicker
Profile Design is best known for producing high quality bike components such as aero bars, base bars, stems and hydration systems at often affordable prices. Their latest product line introduction is the TwentyFour Series wheels which are available as carbon clinchers or tubulars. “TwentyFour” represents the rim width at the braking surface which is 24.5mm’s and is the new standard width for most high end race wheels. The wheels come in rim depths of 38mm, 58mm and 78mm. A popular wheel set for triathletes is the 58(F)/78(R) combo which is very similar to the popular Zipp 404/808 and ENVE 6.7 wheel sets.
Profile Design claims reduced braking distances in dry or wet conditions over that of other carbon fiber wheels by using their proprietary brake pads and higher Tg resins in their wheels. The brake pads use a specially formulated rubber compound, durometer and friction agent. On the rims, they use a 30% higher Tg point resin than other “high” Tg resins resulting in a rim that can withstand more heat, which in turn leads to braking performance unseen on other carbon rims.
The TwentyFour series hubs are forged from 6061-T6 aluminum, then precision machined with a tolerance of 100th of a millimeter, making them durable, strong and stiff. The freehub has an 18% increase in material strength compared to standard aluminum freehubs which prevents the cassette from digging into the freehub body. This results in better shift performance and increased power transfer.
Profile Design also used Course Modeling and CFD (Computational Fluid Dynamics) in designing their wheels. They mapped the performance of their wheels against historical wind speeds, angles and race day conditions of popular road and triathlon courses and consistently came out with distinct advantages across the yaws (wind angles) most commonly encountered. CFD let them manipulate width, width location, depth and conicity to select the highest performing rim profiles.
I recently had the pleasure of riding a 58/78 carbon clincher wheel set. I found them very responsive and stable. They spun up quickly and held their speed during the ride. What really stood out was the braking- which was excellent- probably the best I’ve felt on carbon or aluminum braking surface wheels. It was dry the day I rode, so I can’t vouch for wet conditions braking which is commonly an issue with carbon braking tracks. Aerogeeks.com reviewed the wheels and said there was virtually no difference in the dry or wet braking and they were “astounded that these could be carbon brake track wheels”. I did read one review on Slowtwitch.com that said the braking in wet conditions when it was below 45 degrees wasn’t as crisp because of the hard brake pads used by Profile. Their recommendation was to use softer pads for those conditions. The day I rode was fairly windy and I did feel a little push on the front wheel at times but nothing out of the ordinary for an aero wheel. It’s not really a concern for me but probably something to be aware of on windy days.
Weight on the 58/78 CC’s is 1724 grams, compared to the Zipps 404/808 CC’s 1740 grams and the ENVE 6.7 CC’s 1601 grams, so there’s not too much difference there.
I’ve ridden Zipps and ENVEs which are excellent wheels and the Profile 58/78’s held their on, which leads me to the biggest difference, PRICE! The MSRP on a Profile 58/78 carbon clincher set is $2050, compared to a Zipp 404/808 carbon clincher set at $2869 and an ENVE 6.7 carbon clincher set at $2900. Enough said?
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Mark Wicker is the Inside Out Sports wheel manager, Cary floor manager and a bike fitter. He started doing triathlons in 2000 and has completed 100+ triathlons since then. When not working, he trains using the patented “Wicker” training plan. You can reach him at email@example.com.
Despite a couple of niggles, the Reynolds Aero 58s are excellent wheels: fast, stiff and stable in sidewinds.
New from Reynolds for 2013 is the Aero wheel range, featuring new rim shapes and other technology designed to cheat the wind and increase your speed. The range is clincher only, and comprises three rim depths: 72mm, 90mm and the 58mm model tested here, which is likely to appeal to the road racing crowd as well as triathletes and time triallists.
The biggest news is the development of a new rim cross section which Reynolds term Dispersive Effect Termination, or DET for short. Here's the man behind the idea, Paul Lew to give you a quick overview of the benefits:
In keeping with the trend for wider wheels pioneered by the likes of HED and Zipp, the Aero 58 (and indeed all models in the range) feature a brake track width of 26.2mm. To put this into perspective, the Zipp 404 Firecrests measure in at 24.7mm, though they do balloon out to 26.5mm below the brake track.
All aero benefits aside, this width could cause some issues with clearance, especially in older frames designed before the advent of wider wheels - I struggled to get them to clear my brake pads on my time trial bike for example. Try before you buy is most definitely recommended.
The wide brake track is where the similarities to the Firecrest and other wide rim shapes end however, as the Aeros taper down to a sharp point at the trailing edge, contrasting with the blunt trailing edge employed by nearly all the competitors.
Despite the increase in overall rim width, the width between bead hooks is still pretty conventional at around 15mm. As a result, 23mm tires are the maximum recommended for aerodynamics as a wider tyre will tend to balloon outwards, adversely affecting the transition between tyre and rim.
The reason for the narrow internal width is that the rim steps outwards from the leading edge to the brake track, creating a little ledge which runs around the whole wheel. The purpose of this is to create a zone of low pressure to help re-attach the air to the rim surface, after it has been disturbed by the tyre. This feature is unique to the 58mm and 72mm versions, as the 90mm version actually features a step on the inside surface - the idea being that air behaves differently as it passes over rims of different depths, so each rim shape must be unique.
For those geeks out there (myself included) Reynolds have published a white paper going through the design process and testing of the DET technology. This is available on the Reynolds website [currently down or we’d link to it - Ed]. In summary, there's been a lot of thought and effort gone into the aerodynamics of these wheels - even the valve hole is aero optimised.
As well as aero performance, the other key consideration with full carbon clinchers is their braking performance. The Aero range employes Reynolds' CTg (Cryogenic Glass Transition) brake track which is a specific carbon laminate claimed to improve heat dissipation, thereby providing a more consistent braking performance even under extreme use. The wheels come with Reynolds' Cryo Blue brake pads, designed specifically for the CTg surface. Use of any other brake pads will invalidate your warranty.
One the road: speed increase & cross-wind stability
Out on the roads, the Aero 58s are discernibly fast and easily give you a 2km/h speed increase over a high profile wheel such as a Mavic Ksyrium (my normal training wheels). As a power meter user, I was consistently impressed with the average speeds I was able to achieve on rides where my power wasn't anything special. Comparing the Aero 58s to other wheels of similar depth (in terms of pure straight line speed) would require proper wind tunnel testing as the differences are too subtle to fully appreciate while out riding. Reynolds claim their wheels to be the fastest but then they would, wouldn't they?
What was most surprising was the 58s stability in crosswinds. Recent weather has been very windy and provided the perfect testing grounds for wheels claiming to be the best handling on the market. Consistent, high cross winds proved no problem whatsoever, it was only in really gusty conditions, such as when passing a gap in a hedgerow, that the 58s could be unsettled. Such was their predictability that I had no issue taking them out in 20+mph winds a mere 10 days after breaking my collarbone. I was able to test the wheels back to back with a set of Enve Smart 3.4s and felt that the Aero 58s were easier to handle despite being nearly 20mm deeper on the front wheel.
Braking performance in the dry is very good, with a smoothly progressive feel and plenty of top end power. Coming directly off Mavic's market leading Exalith braking surface onto these 58s, the difference in power and modulation was only small.
However, despite the revised Cryo blue pad design with large water shedding slots, the Aero 58s still exhibit the delay between applying the brakes and actually slowing down that affects most rim brakes. When the power does turn on, it is quite grabby so you really have to be paying attention. By no means are the 58s bad in the wet compared to other carbon wheels, but there's still some way to go before they are as predictable as alloy wheels.
At 1601 grams (measured, without skewers), the Aero 58s aren't going to set weightweenies' hearts a-flutter, but this is still pretty good for a clincher wheel of this depth. More importantly, the wheels ride a lot lighter than they are, being easy to get up to speed when sprinting out of corners.
Deep section carbon wheels often suffer from brake rub due to an imbalance between the rim stiffness and the spoke stiffness. The push towards improved aerodynamics has led to reduced spoke counts which simply can't handle to stiffness of the deep section, carbon rims. You often see the Tour sprinters using custom wheels with more spokes for this very reason. I couldn't tempt the Aero 58s into any sort of brake rub, which speaks to how balanced the wheels are. It's obvious that plenty of thought has gone into making this the ultimate road racing wheel.
From a performance point of view, the Aero 58s are right up there with the best wheels in the market. However, when considering dropping over 2 grand on a set of hoops, you want every detail to be perfect. I had a couple of niggles with the Reynolds Aero 58s which put a small damper on an otherwise flawless performance.
Firstly, the wheels tend fill up with water when riding in the wet. The internal nipple design - another bugbear of mine but not such an issue on clinchers - means that there are plenty of entry points for water around the locations at which the spokes enter the rim. You have to take the tyre off to drain the rim which is a pain.
A couple of handy little bungs are included with the wheels, which prevent the valve from rattling around and seal the valve hole from water, but these both fell off after a couple of rides. You'd have thought this would have been identified in the road testing stage but obviously the roads in Utah are a lot smoother than in the west country.
And finally, why do wheel companies insist on supplying wheels with crappy external cam skewers that die after a few rides in the wet? Yes, they are light, but skewers are one place I'd prioritise function and safety over shaving a couple of grams. My advice: stick a couple of Shimano skewers on them and be done with it.
Foibles aside, the Aero 58s have muscled their way to the top of the mid-depth carbon clincher pile.
Fast, quick-accelerating and superbly stable in crosswinds, the Aero 58s set the new benchmark in carbon clincher performance.
road.cc test report
Make and model: Reynolds Aero 58 clincher wheelset
Tell us what the product is for, and who it's aimed at. What do the manufacturers say about it? How does that compare to your own feelings about it?
Reynolds describe the Aero 58s as a "phenomenal all-around wheel for the road racer, serious, performance oriented cyclist or that triathlete wanting just a little more of a competitive edge"
Tell us some more about the technical aspects of the product?
Rim Depth: 58mm
Width: 26.2 mm
Design: Computational Fluid Dynamics / A2 Wind Tunnel Verified
Spokes Front: Aero Spokes
Spokes Rear: Aero Spokes
Weight: 1601g measured without skewers
Hubs: Custom DT Swiss straight-pull
Compatibility: Shimano / SRAM / Campagnolo
Braking: CTg Braking System
Brake Pads: Reynolds Cryo-Blue
Aero Feature: DET™ Dispersive Effect Termination
Rate the product for quality of construction:
The rims themselves were defect free. The DT Swiss hubs are a safe and reliable choice for such a wheel
Rate the product for performance:
Quite simply the best carbon clinched on the market at the moment
Rate the product for durability:
The test period was only a month long so long-term durability wasn't tested. That said, the DT Swiss hubs are renowned for their durability so I don't foresee any problems coming from those
Rate the product for weight, if applicable:
In line with other leading wheels of similar depth
Rate the product for comfort, if applicable:
The Aero 58s could never described as comfortable, but they do deliver a very smooth and damped ride which is quite addictive
Rate the product for value:
At £2300, the Aero 58s are a similar price to other models from leading manufacturers.
Tell us how the product performed overall when used for its designed purpose
The wheels are super fast in a straight line but can also handle cross winds. For flatter road races or hilly time trials, they are just about perfect
Tell us what you particularly liked about the product
The cross wind performance
Tell us what you particularly disliked about the product
Wheels filling up with water when ridden in the rain
Did you enjoy using the product? Yes
Would you consider buying the product? I wish
Would you recommend the product to a friend? Yes
Age: 21 Height: 190cm Weight: 69kg
I usually ride: Canondale EVO Red My best bike is:
I've been riding for: 5-10 years I ride: Every day I would class myself as: Semi pro
I regularly do the following types of riding: road racing, time trialling, cyclo cross, commuting, mtb,