Giro
Register II MIPS
Everyday adult helmet with MIPS and a simple dial fit.
Universal Adult, 54–61 cm
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Specialized Mountain frame
Specialized Rockhopper Size Chart
Rockhopper uses Specialized's mountain alpha ladder, not S-Sizing, and the Comp frame runs XS to XXL. The geometry table publishes two column sets: 27.5-inch wheels for XS, S and M, and 29-inch wheels from S up. The numbers here are the 29-inch columns wherever the frame offers them.
- Frame sizes
- XS–XXL · 6 sizes
- Rider height
- 4'8"–6'9"
- Height (cm)
- 142–206 cm
- Stack / reach · M
- 616 / 425 mm
Rockhopper Comp size finder
Which Rockhopper Comp size covers your height?
Height gives you one size, or two when the published height ranges overlap. Stack, reach, and standover settle the overlap.
ft
in
Enter your height and the Rockhopper Comp size that covers it is marked in the tables below.
How to measureHeight gives the starting size. Standover and reach confirm it.
Height ranges
Where each size starts and ends
Height ranges for every Rockhopper Comp size, 138 to 210 cm overall. XS: 142 to 155 cm. S: 153 to 165 cm. M: 163 to 178 cm. L: 175 to 185 cm. XL: 183 to 195 cm. XXL: 193 to 206 cm.
- XS142–155 cm
- S153–165 cm
- M163–178 cm
- L175–185 cm
- XL183–195 cm
- XXL193–206 cm
138 cm174 cm210 cm
Size chart
Rockhopper Comp size by height
Rider height is Specialized's published Rockhopper chart. Specialized publishes no rider inseam for this family, so the table shows height only. XXS belongs to the Rockhopper 26, a different frame this ladder does not cover.
Size
Height
Height cm
Inseam
Fit note
XS
4'8"–5'1"
142–155 cm
–
Smallest Comp frame, on 27.5-inch wheels, with the lowest standover in the ladder.
S
5'0"–5'5"
153–165 cm
–
The first size offered on 29-inch wheels; Specialized builds S in both wheel sizes.
M
5'4"–5'10"
163–178 cm
–
Most riders start here. Stack and reach above are for this size.
L
5'9"–6'1"
175–185 cm
–
27 mm more standover than M. The largest step in the table is the XS to S one, at 74 mm.
XL
6'0"–6'5"
183–195 cm
–
Reach grows 20 mm from L while stack grows 14 mm, so the cockpit lengthens more than the front end rises.
XXL
6'4"–6'9"
193–206 cm
–
Tallest Rockhopper Comp frame, with the highest standover at 853 mm.
XS
4'8"–5'1"
142–155 cm
Smallest Comp frame, on 27.5-inch wheels, with the lowest standover in the ladder.
S
5'0"–5'5"
153–165 cm
The first size offered on 29-inch wheels; Specialized builds S in both wheel sizes.
M
5'4"–5'10"
163–178 cm
Most riders start here. Stack and reach above are for this size.
L
5'9"–6'1"
175–185 cm
27 mm more standover than M. The largest step in the table is the XS to S one, at 74 mm.
XL
6'0"–6'5"
183–195 cm
Reach grows 20 mm from L while stack grows 14 mm, so the cockpit lengthens more than the front end rises.
XXL
6'4"–6'9"
193–206 cm
Tallest Rockhopper Comp frame, with the highest standover at 853 mm.
Start with height. If two sizes overlap, use cycling inseam to choose.How to measure
Geometry
Rockhopper Comp geometry by size
Stack, reach, and standover for every Rockhopper Comp size, read from the 29-inch columns of Specialized's geometry table. XS has no 29-inch column, so its numbers are the 27.5-inch ones.
Size
Height
Stack
Reach
Standover
XS
4'8"–5'1"
559 mm
375 mm
658 mm
S
5'0"–5'5"
607 mm
405 mm
732 mm
M
5'4"–5'10"
616 mm
425 mm
754 mm
L
5'9"–6'1"
626 mm
445 mm
781 mm
XL
6'0"–6'5"
640 mm
465 mm
820 mm
XXL
6'4"–6'9"
654 mm
485 mm
853 mm
XS
4'8"–5'1"
- Stack
- 559 mm
- Reach
- 375 mm
- Standover
- 658 mm
S
5'0"–5'5"
- Stack
- 607 mm
- Reach
- 405 mm
- Standover
- 732 mm
M
5'4"–5'10"
- Stack
- 616 mm
- Reach
- 425 mm
- Standover
- 754 mm
L
5'9"–6'1"
- Stack
- 626 mm
- Reach
- 445 mm
- Standover
- 781 mm
XL
6'0"–6'5"
- Stack
- 640 mm
- Reach
- 465 mm
- Standover
- 820 mm
XXL
6'4"–6'9"
- Stack
- 654 mm
- Reach
- 485 mm
- Standover
- 853 mm
XS4'8"–5'1"
Stack559 mmReach375 mmS5'0"–5'5"
Stack607 mmReach405 mmM5'4"–5'10"
Stack616 mmReach425 mmL5'9"–6'1"
Stack626 mmReach445 mmXL6'0"–6'5"
Stack640 mmReach465 mmXXL6'4"–6'9"
Stack654 mmReach485 mm
How neighboring sizes compare
If two sizes both fit, compare reach and standover rather than assuming the larger size is more comfortable.
How to measure a bike frame- Size stepStackReachStandover
- XS → S+48 mm+30 mm+74 mm
- S → M+9 mm+20 mm+22 mm
- M → L+10 mm+20 mm+27 mm
- L → XL+14 mm+20 mm+39 mm
- XL → XXL+14 mm+20 mm+33 mm
Starter kit
Helmet, light, lock, bottle, and a pant-leg strap. Size the bike here; buy the complete adult bike at a shop.
NiteRider
Swift 300
Compact USB headlight for commuting and dusk rides.
Handlebar mount, 300 lumens
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Kryptonite
Evolution Mini-7 with 4′ cable
Hardened U-lock plus a cable for wheels or a locked-together pair.
Fits most road, gravel, and hybrid frames
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CamelBak
Podium Chill 21 oz
Insulated squeeze bottle for everyday rides.
Fits a standard ~73 mm cage
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Green Guru
Narrow pant-leg strap
Upcycled inner-tube strap that keeps a pant leg off the chain.
Adjustable hook-and-loop, about 16 in long
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Bike size calculator
Find your Specialized Rockhopper Comp size
Enter your height and inseam for a Specialized mountain bike, then compare the result with this Rockhopper Comp chart.
Sizing notes
Why height alone is not enough
Riders with the same height can need different sizes because inseam, torso length, flexibility, and preferred handling differ.
3 checks
Rockhopper standover is not monotonic: XS is 658 mm, S is 732 mm, and M is 754 mm, but the frame switches wheel size at S, so the S to M step is only 22 mm while XS to S adds 74 mm.
Reach grows 110 mm across the ladder while stack grows 95 mm, so stepping up lengthens the cockpit faster than it raises the front end.
Specialized publishes no rider inseam for the Rockhopper, so height picks the size and standover is the check that decides between two.
Sources
Confirm the exact bike after you have a starting size
Every number on this page comes from the sources below. Check the exact model year there before you buy.
Data reviewed:
Compare
Compare before buying
A size label does not mean the same thing across brands. Compare published geometry before you choose.
Related guides
More Specialized and mountain sizing
Once you have a starting size, compare this frame against the Specialized chart and the mountain guide.
Specialized bike size chart
Compare Rockhopper Comp against broader Specialized size guidance.
Mountain bike size chart
Check mountain sizing by height and inseam before choosing a frame.
Questions
Rockhopper Comp size chart FAQ
Short answers for Specialized Rockhopper Comp sizing.
What size Specialized Rockhopper should I ride?
Start with the Specialized height band: XS for 142–155 cm, S for 153–165 cm, M for 163–178 cm, L for 175–185 cm, XL for 183–195 cm, and XXL for 193–206 cm. Then confirm standover for the size you land on.
Does the Rockhopper use S-Sizing?
No. Rockhopper uses Specialized's alpha ladder, XS to XXL. S-Sizing with S1 to S6 labels belongs to the Stumpjumper family, so an S3 is not a Rockhopper size.
What size Rockhopper fits a 178 cm rider?
178 cm sits at the top of Specialized's M band of 163–178 cm and inside the L band of 175–185 cm. M carries 616 mm of stack and 425 mm of reach; L adds 10 mm of stack and 20 mm of reach with 27 mm more standover.
How tall is a Rockhopper M for?
Specialized publishes Rockhopper M for riders from 163–178 cm (5'4"–5'10"). It carries 616 mm of stack, 425 mm of reach, and 754 mm of standover, and it is the last size before the ladder switches to 29-inch-only geometry.
Does the Rockhopper come in XXS?
Not in this ladder. Specialized publishes XXS for 130–145 cm on the Rockhopper 26, which is a different frame with its own geometry table, so this page covers XS and up.