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The fastest and most aerodynamic of the Cannondale HollowGram range, the R-SL 64 benefits the rider through optimised aerodynamics, low weight and reduced mechanical drag through careful component choice. Light, agile and very fast.
The fastest and most aerodynamic of the Cannondale HollowGram range, the R-SL 64 benefits the rider through optimised aerodynamics, low weight and reduced mechanical drag through careful component choice. Light, agile and very fast.
Cannondale

Cannondale Hollowgram R-SL 64 Carbon TR Clincher Wheel : FRONT

£900.00
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If you are not completely satisfied with your purchase, simply return the item or items to us in their original condition* within 30 days of receipt. You must notify us in writing within 14 working days of placing your order, by post or email of your intention to do this.

RETURN ADDRESS:

Returns Department
7hundred Ltd
68 Peascod Street
Windsor
SL4 1DE

We will issue a refund, credit or exchange the item for a different size / colour if preferred. Delivery charges are only refundable if you have canceled your entire order within the 7 day Cooling-Off Period or where the goods are faulty and a refund is made.

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Incorrect Item

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All refunds will be given as soon as possible, and usually take the form of a refund transaction onto the card used for the original purchase. At the very latest we will refund your money within 28 days from the day we receive your returned item. In the case of incorrect ordering and undisclosed reasons for return, a credit or exchange may be issued and the customer will be expected to pay the return postage costs.

All returns must be accompanied by a completed returns form and a copy of the original invoice.



You can submit a returns form here:

Returns Form

Cannondale Hollowgram R-SL 64 Carbon TR Clincher Wheel : FRONT

Brand:Cannondale

Code:HP8122U1010

The most aerodynamic wheelset ever engineered by Cannondale, the HollowGram R-SL 64 are made for endless miles of cheating the wind.

DT Swiss Aerolite spokes – shaped for lower drag without losing strength – are paired with custom HollowGram hub shells. Ultra-reliable DT Swiss 240 EXP internals at the rear bring a 36-tooth freehub ratchet for instantaneous pedaling engagement while minimising mechanical drag. In HollowGram speak, SL means weight is lowered, responsiveness is increased, and aerodynamic efficiency is maximised.

All HollowGram road wheels punch above their weight class in aerodynamic performance, but the R-SL 64 wheelset punches the hardest. Its incredibly low drag coefficient rivals that of deeper wheels, slicing the wind and carrying speed better than the competition.
Being fast isn't just about blistering pace. It is essential to marry handling with the capacity to cheat the wind - to be responsivene and agilie too. The R-SL 64 rim is specifically engineered to balance aerodynamics with low weight and sharp handling, helping you carve up the corners as well as the flats.

It’s one thing to cut through the wind. It’s another thing to master it.

Built using Cannondale's D.R.A.F.T (Drag-Reducing Aerodynamic Flow Technology), the R-SL64s use an approach pioneered over the course of thousands of testing hours by in-house aerodynamicists and applied to all HollowGram road wheels. D.R.A.F.T leverages data and testing focused on real-world riding conditions – like headwinds, crosswinds, and variable winds that shift as you ride – not just those that are simulated in a wind tunnel. The result is rim properties that work with the wind, not against it, and wheels that help you go faster, not just look faster.

More on D.R.A.F.T

D.R.A.F.T. creates wheels that help you Rise to Speed, no matter the day.

The aerodynamics of road wheels are complex and require a nuanced understanding of various fluid mechanics principles. That’s why Cannondale apply D.R.A.F.T.

D.R.A.F.T. is HollowGram’s approach to aerodynamic design and delivers optimal aerodynamic performance across the range of on-road conditions that riders will experience.

Cannondale combine the variation of aerodynamic drag as a function of yaw angle and environmental wind data, and ensure that every wheel in the HollowGram road lineup is delivering maximum performance on every ride.

Rims and Tyres

The HollowGram R64, 50 and 45 road wheels have a 21mm internal width and 32mm external width, to deliver the best performance with the most common road tyre sizes. This is crucial because the tyre is a key element in wheel aerodynamics. Especially in the case of the front wheel, the tyre is the first part of the bike to meet the air, so the interaction between the tyre and the rim drives the movement of air over the rim, which impacts how much drag the wheel creates. In aerodynamic terms, a bicycle tyre is typically not an efficient shape, and so the rim needs to work with the tyre to minimize separation and maintain flow attachment. For a rim to reduce drag, it needs to encourage the air to reattach to the rim after separating from the tyre and then manage its movement over the surface. The combination of width and shape makes HollowGram rims less sensitive to both tyre construction and size; with minimal aerodynamic penalties for using larger width road tyres.

What is yaw weighted drag and why is it important?

When developing and testing products, Cannondale evaluate drag at a range of yaw angles (the angle between the direction of travel and the effective wind vector). Figure 1 (below) shows a plot of drag against yaw angle. This is a typical output from wind tunnel testing. . Note the significant variation in drag as a function of yaw angle. In this plot, the drag of the wheel decreases as yaw angle increases up to an inflection point where it rapidly increases. This behavior is typical for a high-performance wheel.

The variation in drag with yaw angle raises the question; which yaw angle(s) should be used to evaluate on road performance? This is particularly important in the case when comparing two configurations with intersecting curves. (e.g. Figure 2 below)

Take as an example the HollowGram R50 vs. the Roval Rapide CLX, tested with the same tyres. In this case, both wheels can claim to have the lowest drag at different points across the yaw spectrum.

Which yaw angles are most important?

If yaw angles experienced by a rider were evenly distributed, then a simple numeric average of these results would yield an appropriate average drag number. However, in practice, yaw angles are not equally distributed, and so this needs to be accounted for.

Keep in mind that yaw angle and wind angle are not the same. When a rider is in motion they have a forward component of velocity, which combined with the atmospheric wind, creates the resultant yaw angle. Thus, yaw angle is a function of wind speed, wind direction and road speed. Using statistical functions of wind speed and direction, combined with the geometric effect of forward motion, it is possible to determine an analytical model of yaw angle distribution. The result is a bell curve centered on a yaw angle of 0 degrees (see figure 3 below).

Using this weighting function, it is possible to transform wind tunnel results to create a plot in which the magnitude of drag is scaled proportionally to the probability of a rider seeing that yaw angle on the road. Yaw Weighted Drag is then calculated by taking a weighted average of the weighted drag plot. Basically, this methodology levels the playing field for comparison purposes when testing a range of wheels and tyres against others and removes the capacity for mis-leading statements about being 'best' or 'fastest' through cherry picking data points.

When seen through the context of yaw weighted drag, you see that there is little separating the aerodynamic performance of these two wheels. This method provides two clear advantages for analysis. Firstly, it simplifies the analysis process by combining large subsets of data into a single value for each configuration that encompasses both drag as a function of yaw angle and the likelihood of those yaw angles on the road. Secondly, and importantly from a consumer perspective, it facilitates the objective comparison of on road performance without cherry-picking data from wind tunnel results.

Cannondale use yaw weighted drag when developing all of their performance products to ensure that they are fully optimised across the range of riding conditions that riders will experience.

How does road speed and wind speed affect this approach?

This case study is applied using 40 km/h for road speed and 11 km/h for wind speed. But the model is not rigid and can be applied to different roads and wind speeds. Increasing the road speed or decreasing the wind speed will tighten the yaw distribution, increasing the emphasis on the low yaw angles. Decreasing the road speed or increasing the wind speed will flatten the yaw distribution, decreasing the emphasis on low yaw angles. Cannondale (like many others) use 40 km/h road speed as it is representative of average racing speed and is a speed that is achievable for amateurs in shorter bursts. As such it is a great representation of fast road riding. The 11 km/h value for average wind speed is derived from experimental data and mirrors a similar approach for evaluating road vehicles.

  • €1,077.15
    EUR
  • $1,536.79
    AUD
  • $1,384.86
    CAD
  • $1,689.10
    NZD
  • $967.97
    USD
  • CHF856.10
    CHF
  • kr11,631.18
    SEK
  • kr127,654.12
    ISK
  • kr8,036.84
    DKK
  • kr10,129.79
    NOK
  • ¥144,887.59
    JPY
  • Technical Information
    • Developed with D.R.A.F.T. the 64mm deep, 21mm internal/32mm external width carbon rims are incredibly aerodynamic and tubeless compatible
    • Optimised DT Swiss Aerolite spokes with a 2:1 lacing pattern, giving an highly balanced aerodynamic wheel
    • Built with ultra-reliable HollowGram hubs and premium DT Swiss 240 EXP rear internals for performance and ease of service with custom straight pull hub shell
    • At 1630g a pair the R-SL 64 is impressively stable, in a lightweight package
    • A limited lifetime warranty to give you peace of mind
    • Shimano freehub body compatible

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