IN STOCK

Now with 3.2mm ultra-bladed aero spokes as standard and Formula sealed bearing hubs. Or you can upgrade the hubs and spokes to the lighter Ambrosio Italian sealed hubs with PSR lightweight aero spokes.

Your wheels will be hand built to order here in the UK by Andy Morgan, owner and founder of k1 wheels. Turnaround time is Normally 7-11 days (current actual build times shown at checkout.)

The 58/85UC  deep wheelset is superbly aero, beautifully balanced, and reassuringly well constructed from industry standard Japanese carbon. 

      
The 58mm semi-toroidal front wheel is both superbly aerodynamic and extremely light.(this is the advantage that full carbon offers) The rim shape gives it superb cross-wind handling characteristics too.

This is coupled with our ultra-deep rear 85mm deep rear - to minimise drag and give you every watt of power - and at superbly low weight. Approx 1780 grams a PAIR .

See The Results of aero tests of our 80c wheels at Derby Velodrome April 2017 CLICK HERE

Offered With Full 2 Year Warranty Plus A 14 Day "No Quibble Returns Policy" - If You're Not In Love With These Wheels The Moment You Get Them Just Send Them Back For A Refund Any Time Within 14 Days Of Receipt.

The 23mm wide 58/85UC's 's are built around our modern "semi U" shaped structural carbon semi-toroidal aero rim. designed to run best with 25c to 40c wide tyres but will also run 23c tyres fine).  The rim is designed to cut through the air going forward, whilst maintaining a superb lateral integrity to cross-winds across a full range of wind "yaw" angles.  

In terms of rim width we think we've really hit the sweet spot at 23-24mm wide. We carefully explored all of the many possible widths that aero wheels are being developed in. We developed and continually honed our own testing protocols to this effect - and critically we looked at a whole raft of practical issues too that many rim makers simply overlook. For example frame spacing: Yes its possible to go wider than 23-24mm but at what point do wheels begin to compromise the frame. The last thing you want is to find that your carbon wheels rub your frame the moment you get out of the saddle! 23-24mm wide is in our view the best blend of performance and practical usability in our experience.

Narrow Clearance Frame?: if you have a narrow clearance frame - we can special order in some 20mm wide rims for you and we do find that's the only solution for owners of many older bikes.

NOTE: These wheels are ideal for UK roads and descents in all but the hottest weathers. If you are intending to race very long descents in hot weathers (such as continental summer sportives or just want a more familiar braking feel - you may want to look at our full-carbon filament-wound wheels. All full carbon rim-brake wheels (from all brands) do need more considered "pulsed" braking on long hot descents to prevent rims from heating too much (Our full-carbon filament-wound rims have amongst the highest temperature-resistant rim tech available!). Keep it safe and keep it simple: If you are in any doubt in unfamiliar conditions - Use your Alloys that day. We also advise avoiding latex inner-tubes in unusually hot conditions and upgrading brake-blocks to SwissStop Black Prince.

The technology has come such a long way in recent years that most riders are now fine with full-carbons, and they are lighter of course. We just like to give our customers all the facts . In fact we have never had a single rim issue on any our carbon wheels - we think this is because we are very straight with people about their relative advantages and disadvantages! And please do read our page on safe braking/usage and care for your carbon wheels HERE

TECHNICAL SPECIFICATION