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Cube Reaction C:62 SL review

Snappy out of the gate, the Reaction has a powerful kick

Our rating 
3.0 out of 5 star rating 3.0
GBP £2,299.00 RRP | EUR €2,299.00
Pack shot of the Cube Reaction C62 SL hardtail mountain bike

Our review

Fast reactions to pedal inputs help on climbs, but the stiff chassis affects descending capability
Pros: Instant acceleration; impressive spec, with well-chosen components across the board
Cons: Harsh ride chokes descending speed and rough-trail acceleration; tyres are thin and need higher pressures to prevent punctures, adding to the uncompromising ride feel
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From the first push of the pedals, it’s clear the Cube Reaction is a cross-country race bike. Its stiff, box-like belly helps ensure every ounce of power is delivered to the rear wheel.


It’s traditional in shape, apart from its 110mm stem, and Cube has used its buying power well to fit a decent spec, but how does this all tie in together between the tape?

Cube Reaction C62 SL frame

The Reaction’s frame is a game of two halves, with the down tube and chainstays fairly big and boxy for maximum power delivery, and a more svelte top tube and seatstays keeping weight sensible and adding a touch of comfort, on paper at least.

In theory, the skinny 27.2mm seatpost should add a bit of ‘give’ too. The frame is dropper-ready, but the seat tube diameter limits your options.

Cables enter at the front of the head tube to minimise rub. There’s also plenty of protection against chain suck on the driveside chainstay, although this is less of a problem with 1x drivetrains, as fitted here.

The rear axle requires an Allen key to remove, which will slow things down in a race situation. Mud clearance isn’t the most generous, so you’d struggle to fit a tyre much wider than 2.25in.

Frame geometry is middle-of-the-road compared with the other bikes on test, with 69-degree head and 73.5-degree seat angles plus a 441mm reach (21in size).

Pack shot of the Cube Reaction C62 SL hardtail mountain bike
The long stem and narrow bar are a definite throwback to sketchier times – a shorter stem would improve handling no end.
Russell Burton / Immediate Media

Cube Reaction C62 SL kit

Fox’s 32 StepCast is a popular XC fork for good reason, with a low weight and race-focused damping, which prioritises efficiency over smoothness on small chatter.

You get a full Shimano 12-speed drivetrain and brake set-up, and the bike rolls on Fulcrum wheels, which I had no issues with in testing.

Schwalbe provides the Racing Ray and Racing Ralph tyre combo. The rubber compounds aren’t the softest, but the treads were among the most aggressive on test.

Cube’s own Newmen brand provides the long stem, narrow bar (740mm) and fairly slim grips.

Cube Reaction C62 SL ride impressions

The Reaction’s reactions are punchy, with the direct-feeling back end thrusting you forward with each pedal stroke.

That race-optimised damping keeps the 32 fork stable in open mode, and there’s also an on-bar lockout for tarmac sprints, which I used to good effect on my faster test loop.

Cyclist riding blue Cube Reaction C62 SL hardtail mountain bike
Fox’s 32 StepCast fork has cut-out lower legs to keep the chassis narrower and therefore lighter, while still fitting a Boost front wheel.
Russell Burton / Immediate Media

The Cube is great for sprinting up short, sharp climbs, but on rougher ascents the fairly hard-compound tyres leave the bike scrabbling for grip as they struggle to mould over rocks and roots.

That said, the Reaction performs well in loose, muddy conditions. This is because the Ray and Ralph tyres have sharper, more spaced-out treads than tyres such as Ikons, Rekons and Fast Traks found elsewhere, giving more purchase in the slop.

The difference is marginal, but the Cube powered up slippery climbs. On steep drags, the broad range of the Shimano gearing and the stretched position, thanks to the long stem, mean there are few excuses for not getting to the top. With your weight towards the front axle, there’s no front-wheel lift or wander.

On the way down, the Cube doesn’t quite make the grade. The back end is stiff and the tyres have to be run relatively hard (the skinny carcasses mean you can’t reduce pressure much to increase comfort without risking punctures), leading to a jarring ride that makes it hard to maintain speed over rocks or roots. There’s little noticeable flex from the skinny seatpost.

On tight, twisty tracks, the long stem slows reactions, leaving the Reaction feeling a touch more ponderous than the other XC bikes I had on test.

When it’s steep, your weight is shifted further forward over the front axle, leading to a more nervous feeling; the short 423mm back end does little to add stability here.

On fast, flowy terrain though, the Cube holds speed reasonably well, and it thrives on mellower trails, carving between berms with the XT drivetrain and brakes never missing a beat.


Cube Reaction C:62 SL geometry

  • Sizes (* tested): 15, 17, 19, 21*, 23in
  • Seat angle: 73.5 degrees
  • Head angle: 69 degrees
  • Chainstay: 42.3cm / 16.65in
  • Seat tube: 51.5cm / 20.28in
  • Top tube: 62.8cm / 24.72in
  • Head tube: 13cm / 5.12in
  • Bottom bracket drop: 6.5cm / 2.56in
  • Bottom bracket height: 30cm / 11.81in
  • Wheelbase: 1,133mm / 44.61in
  • Stack: 67.67cm / 26.64in
  • Reach: 44.1cm / 17.36in

How we tested

The bike was tested as part of a four bike carbon hardtail test with a price-point of £2,000 to 2,500.

Testing took place before the Covid-19 lockdown regulations on local cross-country loops, and included short sprints through the woods on natural and purpose-built trails. Comfort was also tested on longer rides.

Bikes also on test:

Product Specifications


Price EUR €2299.00GBP £2299.00
Weight 10.6kg (21in)
Brand Cube bikes


Available sizes 15, 17, 19, 21, 23in
Headset FSA Orbit
Tyres Schwalbe Racing Ray ADDIX Performance 29x2.25in (f)/Schwalbe Racing Ralph ADDIX Performance 29x2.25in (r)
Stem Evo. 318.4, 105mm/Cube Race SL
Shifter Shimano Deore XT
Seatpost Newmen Evolution
Saddle Venec Natural Fit
Rear derailleur Shimano Deore XT (1x12)
Handlebar Newmen Adv. 318.0, 740mm
Bottom bracket Shimano press-fit
Frame C:62 carbon fibre
Fork Fox 32 Float StepCast Performance Elite, 100mm (3.9in) travel
Cranks Shimano Deore XT, 32t
Chain Shimano SLX
Cassette Shimano Deore XT, 10-51t
Brakes Shimano Deore XT, 180/160mm rotors
Wheels Fulcrum Red 77, Double-butted stainless steel