INTENDED USE: A superlight deep section wheelset. And we mean superlight for a deep section. As low as 1580 Grams! And hence way lighter than any other deep alloy wheelset available elsewhere.
Designed for Sportives, Bunch races and Triathlons (from Sprint to IRONMAN distance.)
This is the 40mm deep K1-42SL. Our best selling alloy deep section clincher wheelset!
A high-end Niobium SUPERALLOY aero wheelset for riders who want all the aero benefit and lightness of carbon - but want to stick with a more robust material. Niobium superalloys are aerospace grade materials requiring extremely sophisticated manufacturing processes.
The result is a metal rim with strength similar to Titanium, weight similar to carbon, and responsiveness akin to Steel. You won't find Niobium alloys on mass-produced bike wheels!
Your wheels will be hand built to order here in the UK by Andy Morgan, owner and founder of k1 wheels. (current build times are shown above).
The standard AEROLIGHT build offers an excellent 'entry level' for our top-end K1-42SL wheelset. Built with Italian Ambrosio sealed hubs and our own K1 aero spokes. It offers a great balance of light weight and exceptional build quality.
Or for an additional £30, is our recommended "AEROFLOW" build with superb Miche Italian sealed hubs (the lowest drag hubs available anywhere!) and high end PSR Superlight aero spokes is our fastest rolling multi-function alloy wheelset.
Aerodynamics can be maximised and weight reduced to 1580 grams approx by upgrading to the SUPERAEROLIGHT version with the lightest Bitex hubs and PSR Aero SL spokes.
Or if you simply need the best of all the above - combined with superlative Swiss engineering - then its got to be our DTSwiss 350 version.
The use of such wonderful components enables us to produce a true "pro-level" multi-functional aero wheelset, at a reachable price point. Please be aware this is a tough and light wheelset built for UK roads!
Offered With Full Warranty
This wheel has a very specific place in our range (and in our hearts!). A semi deep section lightweight alloy wheel is the perfect "do-everything-wheelset" for multi-gradient triathlons, time trials and even sportives. Designed to run best with 25mm or 23mm tyres.
Light enough and comfortable enough to get you up those hills in good shape, (with silky smooth bearings to help even more), and aero enough to gift you free-speed on the flats and the downhills. .
We achieved this combination of aero/strength/lightweight - by marrying; the wonderful lightweight kinetic-one aero rim; with superlight hubs; and Sapim CX Ray spokes (which have the distinction of being the lightest, strongest and most aero of all aero spokes)
|RIM||Niobium SuperAlloy - T10 Process.
BLACK -CLINCHER ONLY 40mm deep circumferential
|FREEHUB FITTING||SHIM/SRAM 7/8/9/10/11 or CAMPAG 9/10/11|
|HUB||Miche, DTSWISS or Bitex hubs|
|BEARINGS||Sealed Cartridge throughout – All hub types|
|SPOKES||RANGE OF CHOICES!|
|NIPPLES||Pillar black - self locking|
1695 grams AEROFLOW BUILD
1580 grams SUPERAEROLIGHT BUILD
(weights XDR - add 15 grams shimano)
|Advised Max Rider weights||
90kg 20/24 spokes
110kg 24/28 spokes
Shipping Weight (Box plus wheels)
These wheels have transformed my Cervelo R3. They spin really well and feel very stable. They look great too which is important. They definitely add between 1 and 2 kmh to my average speed. These are wheels which are of excellent quality and stand out from the crowd. Many thanks Andy
I can only add to all the good things said about these wheels. Tremendous.
Only had a couple of short rides on the new wheels, but first impressions are very good.
They feel and ride much lighter than my Fulcrums and they are stiff with no flex or brake rub when hammering it out of the saddle up the climbs, where the lightness is really noticed. I have also hit a few pot holes ( hard not to around here) and no problems there so they are tough as well.
Looking forward to getting a few decent miles in on them.
Overall then .....5 stars , excellent value for money and to top it off Andy is a real good bloke and a pleasure to deal with.
Coming from stock Alexrimms DA22 to these is a massive transformation to a 2009 GT Series Three. Had these wheels just over 6 months now. K1's spin up nice and easy, holding the pace without complaint. Instantly saw average speed jump by 3-4km/h. Rode nicely along national cycling route 23 in the Isle of Wight which is not all tarmac and they stayed true too. They are certainly up to to a daily ride on British roads.
Riden with Michelin Pro3s with Schwable light tubes. Tricky to get on/off the wheel following 2 flats but that is down to the tyre. About to try Conti GP4000s with Conti Race 28 Light tubes. Seem to be a lot easier to get on and off.
Highly recommend these wheels. Excellent communication and discussion with Andy regarding other wheelsets in similar price brackets. Wouldn't hesitate to buy another pair of these for race only.
I ordered my ultralights over the web, after considerable helpful advice from the folks at K1. I was NOT disappointed. They arrived beautifully packed, and ready to go. I was taking my first ride within minutes and MAN what an upgrade from the stock Fulcrum 5's that came with my bike. They ride much smoother, but tougher, and seem to hold momentum much more easily. I feel like I picked up 1k/hr from them, but more importantly, my daily ride is more engaging and fun. They are simply a pleasure. I also like the fact that they are "different" from the stock upgrades out there - and they look great. Highly recommended.
Took a bit of a punt on these - not having had any kit like this since my racing days back in the day. Seriously impressed with these wheels. Had them a few months and they attract lots of attention and they roll like silk. Rob
I decided on these a couple of months back after having researched several other wheel brands to upgrade to and decided to go with Kinetic-one on price and value for money. Chatted through what I wanted with Andy who was very helpful and decided on the K1-42SL. Performance wise they are great, giving a noticeable difference straight away, on a regular long ish route of around 50 miles I felt less fatigued and found I put in a quicker time. Rolling resistance is minimal and I found testing the freewheeling next to a couple of mates that I was rolling faster and longer so the aero design really does work. I ordered these in blue for the only reason that my bike is blue and was not overly bothered but must admit they make the bike look pretty stunning and I've had quite a few comments. Finally and importantly the customer service is brilliant. After a few miles one of the spokes was making a noise, phoned them up, wheel was picked up by courier and returned very quickly, a slightly under tensioned spoke being the culprit so full marks for customer service and communication. If you are thinking of buying these wheels I don't think you'll be disappointed!
Review: The wheels are excellent and did me proud at the recent World Duathlon Championships. They also look nice on my Felt bike (much better than Ottawa last year). As I’m not at the top end of cycling (just yet!), they are affordable but durable at the same time. My bike times are now getting quicker and one day they hopefully match my run times (which is where my strength is within Duathlon and Triathlon). I’m hoping to go to the World Duathlon Championships in Australia next year, if I can get some sponsorship.
Have just been out on my best bike for first time since fitting your 42SL wheels (hence delay with feedback). Well i must say that i was immediately impressed with how taut the bike feels, no flex when climbing and i seem more able to push a higher gear, well pleased! Please find picture of Planet X badged Van Nic pro road, Campag Athena groupset and your brilliant stealth graphic wheels. Many thanks Andy, Retford, Notts
Great deep alloy wheels really well made and they roll superbly well . The customer service is excellent too. I would highly recommend Kinetic-One
Andy lied to me, I didn't become better looking, more successful or intelligent, however, I did get quicker!
On a serious note, lovely wheels (K1 42SL), so much smother and feels faster than my old ones.
I had Campag Zondas on my 2015 SuperSix but I wanted to get some deep section wheels to see what difference they made. Most of the carbon wheels these days have an external rim width of 25mm plus. The gap between the chainstays on my bike is not big enough to take those wheels. I also wanted alloy rims and the wheels to be light. I saw these after surfing online and I'm really glad I did. I bought the SuperAeroLight option. The first ride I really noticed how smooth the bearings were - wow - what a difference. Always wondered what a decent pair of wheels felt like. I've really noticed that my legs are fresher after longer rides.
Fantastic wheels, sooooo smooth! Great service!
Excellent excellent Product and excellent service - though the courier was a day later than I paid for! Though thats not your fault i know. Thanks.
Bought a pair in October 2018 on the recommendation of a family member who owns a set of deep carbons for TTs.
Superb set of wheels, after nearly 5 months of pretty shocking welsh winter weather, still dead true and roll smoothly. On par with the weight of the stock 20ish mm bontrager's I had on before, and although I can't measure the aero benefit, they certainly feel rather speedy when you're pushing the pace!
Fantastic communication throughout the buying process, with Andy recommending the 42SLs and a spec based on my requirements.
10/10 nuff said.