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FiBROUS U-Shape 38 and 50mm Carbon Wheelsets


Aerodynamic and strong wheels for serious speed freaks.  Wheels that help you hold higher speeds, because the deep U-shape directs air better over the whole bike.  Handling and crosswind tolerance are also improved by this shape.

Rims have no holes in the tyre bed, meaning you never have to worry about rim stips again, which saves weight and also means the rim is stronger and stiffer (carbon fibre is much stronger without holes!).

This page has quite a few options.  Please give us a call or message if you'd like to talk with us to find what suits you best.

These are clincher wheels for use with normal road tyres (21C - 38C) and tubes (with valve stem at least 15mm longer than the rim depth) or...
Tubeless - 23 and 25mm wide rims can be run road tubleless without a rim strip or tape necessary, due to the completely airtight tyre bed.  These wide rims also allow more air into your tyre, so you can have the ride of a bigger, cushier tyre without the extra weight (especially if run tubeless).  The width also reduces flex, which along with the fancy grades of carbon and advanced contrustion techniques means these wheels are very laterally stiff. 

Check out these specs:

38x23mm U-Shape Carbon Clincher Wheelset
 - Weight: 1418g  (1360g with ceramic/cxray upgrade)
 - Tubeless compatible - features a lip in the tyre bed to lock the tyre in place.

38x25mm U-Shape Carbon Clincher Wheelset
 - Weight: 1498g  (1440g with ceramic/cxray upgrade)
 - Tubeless compatible - features a lip in the tyre bed to lock the tyre in place.

50x21mm U-Shape Carbon Clincher Wheelset
 - Weight: 1398g  (1340g with ceramic/cxray upgrade)
 * 50x23mm V-Shape version also available (approximately the same weight) *

50x23mm U-Shape Carbon Clincher Wheelset
- Weight: 1498g (1440g with ceramic/cxray upgrade)
- Tubeless compatible - features a lip in the tyre bed to lock the tyre in place.

50x25mm U-Shape Carbon Clincher Wheelset
  - Weight: 1568g (1510g with ceramic/cxray upgrade)
 - Tubeless compatible - features a lip in the tyre bed to lock the tyre in place.

38/50mm Mixed Wheelset
 - Weight: 1408g (Standard version), 1498g (Wide version)
 - Mixing your wheeset makes sense, because your front and rear wheels are effected by air differently. A wider 38mm front wheel directs air out more, so it can flow over the rest of your bike better, while it is an easier wheel to deal with in cross winds than deep rims (the U-shape also helps with this as well). The narrower 50mm rim suits the rear because the rear wheel needs to be stronger, while cross winds are less of a problem, and the deeper rim helps reduce turbulence.  The standard version has a 38x23mm front with a 50x21mm rear.  The wide version has a 38x25mm front, with a 50x23mm rear.

For road disc and cyclocross wheels, these same rims are available, as well as disc specific rims. Please buy these from the "MTB, Cyclocross and Road Disc" page.

All rims feature:

- High-end UD carbon rims with a mix of exclusive carbon fibres like t1000, m60J and MR60.

- Basalt brake track, paired with rubber or ceramic-based brake pads (included with wheels) deliver strong braking performance.

- High temperature-resistant resins, meaning that the carbon clinchers can handle longs descents with confidence, even at temperature above 220 degrees C.

FiBROUS uses very high performance, quality hubs made for us by Bitex.  They feature ultra low weight and a super quick engagement 48-point freehub.  You may not have heard of Bitex, because many larger companies will rebrand them as their own.

Wheels are laced with 28 Sapim D-Light spokes on the rear (radial and 2X) and 24 Sapim aerodynamic spokes on the front - these are an OEM version of the brilliant CX-Ray, with a square section rather than elliptical, offering the same weight and dimensions as the CX-Ray at a lower pricepoint.

All road wheels can be built with Chris King, DT Swiss 240 or 350, or even super-exotic Extralite hubs for competitive prices.  We can also custom build wheels with your choice of hubs, or supply any of the components listed (i.e. rims, spokes or hubs) for you to build your own wheels if that's what you're into.  The second picture is a custom build with good ol' 105 hubs and 32 3X spokes front and rear.   The result was an amazingly solid feeling wheelset that would rival some of the best downhill mountainbike wheels in terms of strength (no kidding) and even lighter riders could feel a big difference when taking the bike for a spin.

Team custom decals are available on enquiry.  Please message for more information.
The $50 discount special on "GO VEGAN" green decals for the 38mm wheels (pictured on the 24, 30, 38mm clincher page) also applies to the 38x23 and 38x25 wheels on this page.

Shipping is worked out for each individual order, to offer the best value and security. We can offer most South Australian orders a free personal delivery, or a meeting place arranged.

FiBROUS rims and wheels are made to order. Build time is usually about 3 weeks. We realise this is quite a while to wait for your fancy new wheels, but this is how we are able to offer a huge range of build options. On top of the rim and hub options, there is the option to have your wheels custom-spoked if you have a preference for wheels that are particularly stiff/strong, aerodynamic or lightweight (pick any 2 of the 3). There is a box below to enter this preference (if any). Or leave blank if you are happy with the standard spoking, which is a good compromise of all attributes for most people. Telling us your weight will help as well, if you like (heavy riders are well catered for by FiBROUS, just let us know!). Also leave the box blank if you are getting the Ceramic/ CX-Ray upgrade, which is a very lightweight build. Alternatively please leave a contact number/email to discuss rim, spoke or hub choice in more detail.

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