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Specialized Rockhopper geometryMTB · 2026 · 11 sizes, from XS - 27.5 to M

The Specialized Rockhopper is a mtb bike available in 11 sizes, from XS - 27.5 to M. Stack ranges from 559 to 654 mm and reach from 375 to 485 mm. Its position sits between racing and endurance. All sizes share 440 mm chainstays.

Stack559–654mm
Reach375–485mm
Head angle68.0–68.5°
Chainstay length440mm
Slack seat angleStable rear

What size Rockhopper 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.

Compare on Fitbikefy →
XS - 27.5S 559 · R 375
S - 27.5S 573 · R 395
M - 27.5S 589 · R 415
S - 29S 607 · R 405
M - 29S 616 · R 425
L - 29S 626 · R 445
XL - 29S 640 · R 465
XXL - 29S 654 · R 485
XSS 559 · R 375
SS 573 · R 395
MS 589 · R 415

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

Geometry chart by size

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

SizeXS - 27.5S - 27.5M - 27.5S - 29M - 29L - 29XL - 29XXL - 29XSSM
Stack559573589607616626640654559573589
Reach375395415405425445465485375395415
Effective top tube541565589586608630654679541565589
Head tube length95100105959510512013595100105
Head angle68.0°68.0°68.0°68.5°68.5°68.5°68.5°68.5°68.0°68.0°68.0°
Chainstay length440440440440440440440440440440440
Wheelbase1,0671,0921,1181,1051,1281,1521,1781,2031,0671,0921,118
Front centre630656682672696719745770630656682
BB drop4343436262626262434343
BB height310310310310310310310310310310310
Fork length475485495505515515515515475485495
Fork offset4242424646464646424242
Trail9797979797979797979797
Standover658695735732754781820853658695735
Seat tube (method not stated)310350400360400450500560310350400
Seat angle (method not stated)73.5°73.5°73.5°73.5°73.5°73.5°73.5°73.5°73.5°73.5°73.5°

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

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Specialized Rockhopper 2026

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Stack and reach of every size

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

360380400420440460480500520540560580600620640660680700reach (mm) →↑ stack (mm)XS - 27.5S - 27.5M - 27.5S - 29M - 29L - 29XL - 29XXL - 29XSSM

Character of each size

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

XS - 27.5
S - 27.5
M - 27.5
S - 29
M - 29
L - 29
XL - 29
XXL - 29
XS
S
M
Positionracing → relaxed
Steeringcalm → quick
Pedallingrearward → forward
Bottom brackethigh → low
Wheelbaselively → planted
Rear endstable → agile

Bikes with similar geometry (size L - 29)

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

ModelΔ stackΔ reach
Specialized STATUS · S22026−1 mm±0 mmCompare →
Canyon Sender · S2027±0 mm−2 mmCompare →
Cannondale Scalpel HT 110 · LG2023+3 mm−1 mmCompare →
Specialized S-Works Stumpjumper · S32026+4 mm±0 mmCompare →
Specialized Stumpjumper · S32026+4 mm±0 mmCompare →
Trek Slash · M2024−3 mm+3 mmCompare →

Frequently asked questions

What size Rockhopper 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 559/375 mm in size XS - 27.5 to 589/415 mm in size M). 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 Rockhopper in size L - 29?

Stack of 626 mm and reach of 445 mm, with an effective top tube of 630 mm and a head angle of 68.5°.

Is the Rockhopper a racing or an endurance bike?

In between. In size L - 29 its stack-to-reach ratio is at percentile 59 of mtb bikes: neither very low nor very tall.