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5 TORWOOD AVENUE, LARBERT, FK5 4NG

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Call us on 07881 724067

Or email info@wheelsmith.co.uk

Wheelsmith Ltd

5 Torwood Avenue

Larbert

FK5 4NG

Opening Hours: Mon-Fri:

09:00 to 16:30

The phone and email are off outwith these times.

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DISC RIMS

DISC RIMS

We have waited patiently for good disc-specific rims to evolve. There are two variations; low pressure CX (large tyre specific) and true road-specific which can handle high pressures.

Previously, some of the strength in a rim has come from the braking surface (which is thicker than the rim side-wall) and the depth of the rim itself. If you remove the braking surface then the entire rim will be weaker and the hook can be forced outwards with high tyre pressure. This can lead to considerable spoke tension loss which can lead to nipples loosening off and the the wheel going out of true. In extreme cases of overinflating tyres on a CX specific rim, the hook can even flare out and the tyre will blow off the rim. The larger the tyre, the greater the effect.

Some of this "hoop-wise" deformation can be avoided by using dedicated "tubular-clincher" tyres from Hutchinson, Tufo, Schwalbe etc, but there is still a noticeable compressive effect at very high pressures on a rim not able to take it. (We have ruled out Stan's Grail rim for this reason, and won't perform any remedial work on wheels designed for cyclocross which are being used with road tyres: Kinesis Crosslight V3 for example).

While some low-pressure specific rims don't need any redesigning to overcome this, a true road rim does. Side-wall thickness is increased and the rim profile should be more rounded. The result is a disc rim which is the same weight as a typical road rim of similar dimensions and intentions.

Combine this with disc hubs which are usually around 100-150g heavier than their road versions, and a few more spokes front and perhaps rear, the wheels will appear heavier. However! All is not lost (or gained) in "feel". Due to the weight being centralised around the hub, they will feel just the same as the road version. And a few extra spokes may stiffen up the wheels for use on rougher roads which can even make you faster, despite the few extra grammes.

Low Pressure Rims.

Stans Iron cross is a Cyclocross favourite. It is very light (around 390g average) and they are quite nicely turned out. Designed from the outset for Cyclocross, it is a 24mm wide rim with a shallow hook for tubeless tyres. They can quite easily be made down to sub 1550g sets but beware - due to the V-section and thin sidewalls, pressures over 60psi can flare out the hook and compress the light extrusion, slackening nipples and breaking spokes. Not recommended above 50psi really. Highly recommended for CX racing at any pressure below that however!

High Pressure Rims

We have three; the Velocity A23 NMSW and two of our own imported rims for the Aero Road Disc and Race24 Disc sets. They are all capable of taking road pressures. The A23 is simply a non-machined version so still has the braking surface under the all-black coating for stiffness and resistance to deformation. The Aero Road Disc will take 100psi easily due to the deep section. Race24 Disc will start to lose tension at about that so best with 25c at less than 90psi. A 28c will start to compress the rim noticeably at about 80psi due to the extra forces in place with the extra volume (50% more volume than a 23c tyre for example). Don't be put off by that - you will probably find, unless you are riding on glass-smooth roads, about 85psi or less is best with a 25c tyre - regardless of what the manufacturers claim on the sidewall. Contact patch will be improved and compliance over poor road surfaces much better.

Of course, all the carbon rims can be built into disc hubs. With the exception of the new ENVE Disc rims, they all retain the braking surface. We haven't used the ENVE disc rims yet but ENVE have enjoyed many years of disc-specific MTB rim technology so they know what they're doing. All the carbon Tubular rims we use are 145psi and clincher 120psi rated. Again, you'd be nothing short of a masochist at those pressures, but it's nice to know you're not restricted.

We now have the Wheelsmith disc hubs in 20/24 and from a local CX champ running this setup and winning plenty races on them in testing last year and recently, we know it works.

(Top Tip: high pressure disc-specific rims make excellent track wheels too - if your local track allows clinchers or tubeless)

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