HomeALLOY Rim Brake Wheels SALE

12 reviews

SALE : Kinetic-One “K1-42SL ULTIMATE” Alloy Aero Wheelset


INTENDED USE:  A superlight deep section wheelset. And  we mean superlight for a deep section. As low as 1650 Grams! And hence way lighter than any other deep alloy wheelset available elsewhere. And HANDBUILT IN THE UK!


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 Nickel strengthened SUPERALLOY aero wheelset for riders who want all the aero benefit and lightness of carbon - but want to stick with a more robust material. Superalloys are aerospace grade materials requiring extremely sophisticated manufacturing processes.

For example the rim joints are both internally tig-welded and pinned - this means that we can achieve incredible strength without the additional weight that normally results from rim joint welding.

The result of such sophisticated processes - is a metal rim with strength similar to Titanium, weight similar to carbon, and responsiveness akin to Steel. You won't find engineered superalloys 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).

Available in a range of build options:

AEROFLOW MODEL: Complete with our own K1 Aero spokes and ultra low drag MICHE HUBS. These are the lowest rolling resistance hubs available anywhere. The Miche hubs are also very rugged, and hence are fantastic for all-season usage. Learn More>>>

Or make some serious weight-saving for only a few pounds more with our AEROLIGHT is built with superb components and attention to detail throughout: Italian Ambrosio sealed hubs are paired 20/28, with the superb PSR 1422 aero spoke. It offers a great balance of light weight, high performance and exceptional build quality.

Aerodynamics can be maximised and weight reduced to 1655 grams approx by upgrading to the SUPERAEROLIGHT version with lightweight 'All season' Bitex hubs and laced with 20/28 PSR Aero SL spokes.

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.

Fully optimised for 25mm and 28mm tyres, (and will also effectively run 23mm tyres if you have narrow clearance or are old skool!.)

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. .


RIM Nickel strengthened SuperAlloy
BLACK -CLINCHER ONLY 40mm deep circumferential
FREEHUB FITTING SHIM/SRAM 7/8/9/10/11 or CAMPAG 9/10/11 or XDR 11/12 
HUB Miche, Ambrosio or Bitex or hubs 
BEARINGS Sealed Cartridge throughout – All hub types

AEROFLOW: K1 Aero Black



NIPPLES Pillar black - self locking
RIM TAPES Included
WEIGHT from:




(weights XDR - add 30 grams shimano)

Advised Max Rider weights



 Shipping Weight (Box plus wheels)

Weight: 4kg

Customer Reviews

Based on 12 reviews
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Sean Quinn - Ireland


Have covered over 1000k on the wheels and they are excellent. They roll really good on our crap roads no problems whatsoever. Thanks again.

Paul Beaumont - Enniskillen


I took the plunge and purchased a pair of K142SL's. Best decision I've made with regards to upgrading my bike. These wheels just keep on running! I've knocked over a minute off a 10 mile TT and have found I'm up with at the front when it comes to the bunch sprint. Even when it comes to climbing they're no slouch. Cheers Andy. Great product.

Jon - Southampton

So much fun and fast

These wheels carry speed so well. I noticed the difference between my old wheels (which I really liked) and these on every part of my ride. They faster on the climbs. They carried speed better when I sat up on the flats. Accelerated better. I’m really pleased with the wheels. I got them with the ride to work scheme which was really simple and well explained by Andy. I would have expected to pay £1200 for a set like this. I got the upgraded hubs which was a very good decision. All round very pleased

Joe Doheny - Carlow, Ireland

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

Steve Clarke - MK

I can only add to all the good things said about these wheels. Tremendous.

Mike Farrugia - Stroud , Gloucestershire

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.


M Thompson - Bucks

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.

Bryan - Singapore

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.

Big Rob - Bishops Stortford

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

Andy Gentle - Suffolk

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!

Mark Harney - Yorkshire

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.

Andrew Henderson - Notts

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

Neil Phelps - Wokingham

Great deep alloy wheels really well made and they roll superbly well . The customer service is excellent too. I would highly recommend Kinetic-One

Matt - Gloucester

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.

John Williams - Yeovil

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!

Charles - Derby

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.

Mark C - South West

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.