Kinesis Racelight 4S Disc review

Enjoy some all-season gains

Our rating 
4.5 out of 5 star rating 4.5
GBP £1,700.00 RRP

Our review

Rides like a weatherproofed race bike, and has the perfect low maintenance groupset
Buy if, You want a great frame you can ride with either rim or disc brakes
Pros: Frame ride feel, 1x drivetrain, road performance
Cons: Creaking saddle, no mudguard flaps
Skip to view product specifications

Maintaining its naming convention, Kinesis brings us the 4S, which stands for four season — an appropriate moniker for a British-designed frame, since we often feel we’ve seen every season in one day in the UK.


The Kinesium down tube goes from teardrop to an ovalised section at the BSA threaded bottom bracket shell, while the top tube sports an oversized bulge, increasing its diameter behind the beefy tapered head tube.

The seatstays are relatively slim, and the chainstays are oversized, but crimped for 28mm maximum tyre clearance, plus the 40mm wide mudguards. There are also fittings for a Shimano flat-mount disc brake and a rack.

The full carbon fork has mudguard eyelets and flat-mount disc fittings too, but is drilled for a conventional long drop rim brake caliper, as is the seatstay bridge, making the 4S frameset unusually inclusive in braking terms.

4S stands for four season
Philip Sowels / Immediate Media

Once you’ve bought the frame, you can spec rim or disc brakes, I opted for discs. The advantage of flat mounts is that if unused, they’re less obtrusive than post mounts. There are additional cable and hose routing options through the top- and down-tubes to cover all bases, including Di2.

Traditionalists will swear by double chainrings, but the SRAM Apex 1 system plus Praxis Works Alba crank with single 42-tooth ring is matched to an 11-36 cassette, giving a range that got me up 20 percent climbs and could still be comfortably spun up to 35mph down hill. The key with single rings is to choose gearing to suit your riding. This worked for me, with no uncomfortable gaps, and I never felt I was short of gears.

Helping the drivetrain do its job, the frameset has length for the rider who likes space to ride, and a high pitched zingy resonance at speed due to its wall thicknesses. It really urges you to get on with it, and is pretty quick when you do, so would be well suited to riders looking for a fast winter road trainer.

The handling is precise, and the ride quality is surprisingly compliant considering the apparent lack of tyre volume.

The Kinesis really urges you to get on with it, and is pretty quick when you do
Robert Smith Photography / Immediate Media

Vee’s 28mm Rain Runner tyres are new to me, and are fitted to Kinesis’ own 24mm wide Racelight Disc wheelset, so it was a surprise to find they measured only 27mm. Running the same 80psi in relatively narrow tyres gave a greater impression of speed on tarmac, although reduced air volume brings compromises if leaving it.

Ritchey’s finishing kit is always of good quality, with smart looks, and I liked the Logic Curve bar’s deep drop. The Skyline saddle creaked constantly between shell and rails, which is unusual, and something I’d consider unlucky. Its shape and support were excellent though. Toe overlap with the aluminium Fend Off mudguards wasn’t an issue, but I would have liked to see flaps supplied.

The Apex drivetrain works faultlessly, and with only one shift paddle to think about, simplifies gear choices. The brakes, once the TRP rotors had bedded in, were strong and well-modulated.


The 4S frameset has a positive ride feel that’s lively but with great solidity, making it a strong contender for anyone in need of a Swiss Army knife of a training bike that doesn’t lack performance.

Product Specifications


Name Racelight 4S Disc
Brand Kinesis

Available Sizes 45.5cm 48cm 51cm 54cm 55.5cm 57cm 60cm 63cm
Seat Tube (cm) 50.5
Shifters SRAM Apex 1
Stem Ritchey Comp alloy
Trail 6.1
Weight (kg) 9.15
Wheelset Kinesis Racelight 700 Disc
Chainstays (cm) 42
Top Tube (cm) 56
Seat Angle 74
Wheelbase (cm) 101
Frame size tested 57cm
Head Tube (cm) 17.5
Stack (cm) 58.24
Reach (cm) 39.61
All measurements for frame size tested 57cm
Seatpost Ritchey Comp alloy
Saddle Ritchey WCS Skyline
Bottom Bracket BSA
Frame Material Smooth weld Kinesium tubing
Brakes SRAM Apex 1, TRP 160mm rotors
Cassette SRAM PG1170 11-36
Chain SRAM PC1170
Cranks Praxis Works Alba, Wave Technology 42t
Fork Kinesis Tracer carbon
Fork Offset 4.5
Front Derailleur SRAM Apex 1
Rear Wheel Weight 1870
Front Tyre Vee Tyre Rain Runner, 28mm
Front Wheel Weight 1320
Handlebar Ritchey Comp Logic Curve
Head Angle 72.5
Headset Type FSA
Rear Derailleur SRAM Apex 1
Rear Tyre Vee Tyre Rain Runner, 28mm
Bottom-bracket drop (cm) 6.5