The BORG50C wheelset is my aerodynamic offering. The rims are 50mm deep and 26.2mm wide. The internal width is 18.5mm. They are built by me in the U.K. An elite woman's team - Team on Form are using these wheels with the IRC Formula Pro RBCC tyres.
The wheels are comfortable and the aero gain just helps you feel like your on a good day which is always welcome. The wide rim helps improve the bikes ability to corner as the tyres don't deform as much under side loads and the braking in all conditions is good. Crosswinds stability is also very good. The elite women's race team ladies are not big and heavy, they are racers and winners and they don't suffer in the wind.
The tyres are important. The IRC Formula Pro RBCC 25mm tyres are supplied to team on form and these are the tyre I recommend for everyone because they are very durable, grip like nothing else, puncture resistant (although not invulnerable like some people think) and the width on these rims at 100 psi (this is maximum tyre pressure I suggest) is 25mm (height is 21mm). The width being, 95.4% of the rim width, minimises drag and maximises the stall angle of the wheel given its width. The IRC Roadlites in 23mm sit at the right width too but the 25mm tyres are big at 27.5mm wide and therefore less aero with a lower stall angle.
23mm Continental GP40000s, 23mm Schwalbe Pro one and other tyres sized like these are close to optimum. Bigger will increase drag.
The UD finish rims don't have decals. The BORG50C logo's are part of the finish of the rim. the logo cant peel of. It is not water transfers either, there is nothing to peel off in fact the logo is slightly recessed.
Wide rims also mean a larger tyre volume, giving almost tubular-like ride and also grip in the bends is improved. IRC tubeless tyres are easy to mount and remove. Max pressure for the rim is 120 psi but no more than 100psi is necessary depending on tyre choice and rider weight.
The rims have a good brake track with a high Tg resin's. The resins used means rim overheating is not an issue but we can't change Physics (no -one can), carbon rims dissipate heat more slowly than metal rims. Rule of thumb if the braking load would get alloy rims to hot to handle then don't do that decent on any carbon clincher rim. The Cycle Clinic supplies the wheels with Campagnolo carbon brakes pads, in Shimano or Campagnolo pattern. Braking performance is as good as it is on alloy rims with good pads and brakes. Braking in the wet is good too. Rim wear does not seem to be a big issue on these rims either. My own prototype set did over 20000 km of all weather use but a wet Strada Bianca ground the rims down and they are now spare wheels.
The spokes used are Sapim CX-ray with black SILS alloy nipples. The rear 24H wheel is laced 2x and the front 20H wheel is laced in a radial pattern.
Hubs offered are;
1) Miche Primato - wheel set weight 1670g big bearings that last, steel rear axle, bearing preload adjusters, Shimano 8/9/10/11 speed freehub or Campagnolo 9/10/11 speed freehub. A robust all weather hubset.
2) Carbon Ti hubs - wheelset weight 1470g. Light weight hubs that come in anodised colours. Matching sapim coloured nipples are used (well the colour may not be an exact match but it is close) and carbon Ti skewers (weight 39g) these Q/R's have titanium axles and levers are supplied. Coloured hubs are special order so extra time may be needed to fulfill this order. These hubs use 1x 6903 and 3x6803 bearings in the rear hub, 17mm axles, 4 pawl freehubs and they have bearing preload adjustment. Simple light and reliable hubs. You pay for it mind. Shimano 8/9/10/11 speed, Campagnolo 9/10/11 speed freehubs available.
Colour options with carbon Ti hubs;
To select the colour send me an e-mail regarding colour choice. Some colours may result in a delay in building as it may take more time to get them from Carbon Ti in Italy.
With coloured hubs you can select between silver or black CX-ray spokes again an e-mail.
All the Campagnolo freehubs offered are 9/10/11 speed compatible. All the Shimano freehubs offered are 8/9/10/11 speed compatible and they come with a spacer for 8/9/10 speed cassettes (although an additional 1mm spacer supplied with a 10 speed cassette is needed too).
The BORG50C wheelset are supplied as wheels tubeless ready, with IRC clinchers installed with tubes or with IRC tubeless tyres set up.
With the IRC Formula Pro RBCC tyres 25mm, the tyres will be fitted. These are 25mm wide on these rims perfect really. If the IRC Roadlites are opted for 23mm or 25mm tyres can be fitted. The 23mm tyres will be 24 to 24.5mm wide and the 25 mm tyres will be 27mm wide. Tell me which you want at checkout.
The IRC Aspite Pro Wet 24mm tyre uses the same grippy RBCC compound as the formula pro tyres but this tyre is for tubes. Continental inner tubes will be used with valve extenders fitted.
So many manufacturers offer carbon rimmed aero wheels now but none come with the guarantee I offer (which applies to all wheels that I build) and none are better, honest truth. There is no weight limit as such on these wheels but be sensible.
What you get
- An aerodynamic wheelset front and rear.
- VAR rim tape, tubeless valve and extenders
- Miche Q/R skewers for Miche hubs and Carbon Ti Q/R for Carbon Ti hubs.
- Tubeless IRC tyres installed if you go for that option. I recommend that you do.
- Campagnolo carbon brake pads in shimano or campagnolo form.
- The best guarantee (for the life of the rim against spoke failure and anything that could be termed a defect) i.e. problems fixed at my cost not yours
- Crash replacement at cost of parts only no labour.
Brake track warping due to overheating is not a warranty fault. I will however rebuild at cost of the rim only. You need to observe the rule of thumb in the text above.
If the rim cracks (spoke holes) then that is a warranty (none have yet)
If a spoke breaks or the wheel goes more than 0.5mm out of true that is a warranty (none have yet lets keep it that way).
If a fault with the hub appears that is is not bearing wear then that is a warranty.
I rely on honesty so if the damage is related to impact then I will fix the wheel as the cost of the parts alone.
Other things to buy with this wheelset
Carbon Ti Quick release skewers