Cube Reaction SLX geometryMTB · 2026 · 5 sizes, from XS to XL

The Cube Reaction SLX is a mtb bike available in 5 sizes, from XS to XL. Stack ranges from 601 to 658 mm and reach from 383 to 452 mm. Its geometry is tall and short, built for comfort.

Stack601–658mm

Reach383–452mm

Head angle68.2–68.2°

Chainstay length437–452mm

Stable rearRelaxed

What size Reaction SLX do I need?

Enter the stack and reach of a bike that fits you well and we will tell you which size is closest and how to set it up.

Stack in mm Reach in mm Compare on Fitbikefy →

XSS 601 · R 383

SS 616 · R 400

MS 630 · R 417

LS 644 · R 434

XLS 658 · R 452

Enter your stack and reach to see which size fits you best.

Geometry chart by size

Measurements in mm and degrees, as published by Cube. The ones that matter most for choosing a size are in bold.

Size	XS	S	M	L	XL
Stack	601	616	630	644	658
Reach	383	400	417	434	452
Effective top tube	555	576	598	619	640
Head tube length	112	128	112	127	142
Head angle	68.2°	68.2°	68.2°	68.2°	68.2°
Chainstay length	437	437	452	452	452
Wheelbase	1,076	1,090	1,136	1,158	1,181
Seat tube (method not stated)	340	375	430	485	535
Seat angle (method not stated)	74.0°	74.0°	74.0°	74.0°	74.0°

Source: Cube official website · data from 11 Nov 2026.

Stack and reach of every size

Higher means a taller front end; further right means a longer reach. The blue dot is your search.

Character of each size

Compared with other mtb bikes. Further right means more of that quality.

Positionracing → relaxed

Steeringcalm → quick

Pedallingrearward → forward

Bottom brackethigh → low

—

Wheelbaselively → planted

Rear endstable → agile

Bikes with similar geometry (size M)

The closest size of other mtb models, by stack and reach.

ModelΔ stackΔ reach

Cube Reaction · M2026±0 mm±0 mmCompare →

Wilier Triestina 503X Race · M2024−2 mm−5 mmCompare →

Cube FRITZZ C:62 Super · S2026±0 mm+6 mmCompare →

Cube FRITZZ C:62 · S2026±0 mm+6 mmCompare →

Canyon Torque AL · XS2027−6 mm+3 mmCompare →

Cannondale Habit Carbon LT · SM2022−4 mm+8 mmCompare →

Reaction SLX or Reaction? In size M they have exactly the same stack and reach (630 / 417 mm): the difference is in the frame and build, not the position.

Frequently asked questions

What size Reaction SLX do I need?

It depends on your position, not just your height. The most reliable way is to compare the stack and reach of a bike that fits you with those of each size (from 601/383 mm in size XS to 658/452 mm in size XL). The size finder on this page shows the closest size and the stem and spacers you would need.

What are the stack and reach of the Reaction SLX in size M?

Stack of 630 mm and reach of 417 mm, with an effective top tube of 598 mm and a head angle of 68.2°.

Is the Reaction SLX a racing or an endurance bike?

Endurance. In size M its stack-to-reach ratio is at percentile 93 of mtb bikes: a tall, short position.

Does it have the same geometry as the Reaction?

In size M, yes: same stack and reach. If one already fits you, the same size of the other will put you in the same position.