Kinesis Racelight 4S Disc
The Kinesis Racelight 4S Disc is the descendent of the market leading all-round fast training bike that was the Racelight TK. Using Kinesium, the same proprietary alloy that gave the TK such an engaging and refined ride, the 4S has been significantly revised to deliver true 4-Season performance and capability.
Although called the 4S "Disc", it can be built either deep-drop rim brakes or with disc brakes. And all without compromising the clearance that enables the fitting of wider tyres - up to 32mm without mudguards and 30mm with.
The tuned Kinesium tubing is tough, light and delivers outstanding levels of comfort. The ride is agile and engaging, just as the Racelight TK was before it, with the option of disc brakes for unrivalled stopping power and control, whatever the season. Refinements to the frame include that improved tyre clearance, along with full internal cable routing and Di2 compatability. Integrated and discrete mudguard mounts are key to its place as a winter training and commuting favourite, while rear rack mounts make the Racelight 4S suitable for light touring. Strip it all back howvere, and you have a high performance bike for all-round riding, whatever the surface, with plenty of comfort for long hours in the saddle.
The geometry is the same classic road geometry that Kinesis have used for over a decade and a half in establishing themselves as the default for club riders looking for a winter=proof bike that doesn't mean a big change of position compared to their race or "Sunday best" bike.
"The aim of the 4S is to provide a bike that will be worthy of use throughout the four seasons and it has undeniably succeeded. The frame feels responsive, agile, punchy, when it needs to be, but these qualities are offset with equal amounts of comfort - enhancing characteristics and that is a difficult marriage to make.
A winter bike must be comfortable and hard wearing, but it mustn't let you forget you're a road cyclist, and the Kinesis 4S treads this line admirably." BikesETC
The Kinesis Racelight 4S comes to us as a frameset, which can then be built up into a complete bike in our workshop using components of your choice. All three colour schemes offer a deep lustrous metallic finish, with matching full carbon forks.
Kinesis Racelight 4S Technical Highlights
- The 4S disc frameset includes fork, headset, seatclamp and post mount adapter [160mm]
- Compatible with either disc brakes or long drop caliper brakes [47-57mm drop]
- Smooth welded Kinesium tubeset is optimised for stiffness in the front triangle with compliance for comfort in the rear triangle
- Tapered headtube with integrated FSA type headset
- Colour matched full carbon fork with flat mount, eyelets and long drop brake caliper mount
- Internal cable routing via adaptable cable ports and special BB shell, Di2 compatible
- 130mm and 135mm rear QR hub compatible – removable bolt in dropout spacers included
- Will fit up to a 30mm tyre with full guards, or 32mm without
- Two bottle mounts, mudguard mounts and rear rack mounts
- Threaded BSA BB 68mm
- 31.8mm front mech/seat clamp
- 27.2mm seat post for enhanced comfort
- Sizes: 48cm- 51cm – 54cm-55cm - 57cm – 60cm – 63cm
- Colours: Cyan Metallic Blue, Steel Silver/Orange or Grey/Purple
Kinesis Racelight 4S Geometry
Kinesis Racelight 4S Disc Reviews
Verdict: Engaging and versatile disc-ready frameset that'll take rim brakes too.
The Kinesis Racelight 4S Disc is the disc-ready evolution of Kinesis' winter platform. 4S stands for Four Seasons and this is certainly a frameset that's capable enough for building up and riding at any point during the year.
There's nothing it likes better than kicking off in response to a big jump on the pedals, and the big downtube and beefy stays make for excellent power transfer with no hint of flex.
I took the 4S Disc on long training rides, commuted to work on it, did sprint intervals on it and even rode it round muddy reservoir trails in the dark, and it was happy enough doing any of that.
ROAD.CC - ARTICLE
For a bike to be ridden through the vagaries of British weather, the 4S Disc frame and its build kit make a lot of sense. There’s enough clearance to use wider tyres and still fit mudguards.
With quite a short head tube, the bike’s stack is low. This wasn’t uncomfortable though and made for a feel much more like a bike designed for racing than an endurance machine. For a winter machine, this seems like an attractive proposition, meaning that you will not have to adjust your position too much from that which you would have on your summer bike.
CYCLING WEEKLY - ARTICLE
VERDICT: A superb British-designed, disc-ready all-rounder.
Designed for typically wet and variable UK riding conditions, the Kinesis Racelight 4S – which stands for ‘four seasons’ – promises to be a year-round ride for all your training and racing needs.
When climbing or sprinting the 4S responds well, with little noticeable flex in the frame or wheels and although the overall weight is on the bulky side thanks to those disc brakes, it never felt slow or hard work on longer rides.
CYCLIST - ARTICLE
The aim of the 4S is to provide a bike that will be worthy of use throughout the four seasons and it has undeniably succeeded. The frame feels responsive, agile, punchy, when it needs to be, but these qualities are offset with equal amounts of comfort - enhancing characteristics and that is a difficult marriage to make.
A winter bike must be comfortable and hard wearing, but it mustn't let you forget you're a road cyclist, and the Kinesis 4S treads this line admirably.