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 Stumpjumper Size Chart
Stumpjumper uses Specialized's S-Sizing ladder, S1 to S6, which is a different system from the alpha sizes on Rockhopper. The bands are wide on purpose and they overlap: a 173 cm rider sits inside S2, S3 and S4 at once.
- Frame sizes
- S1–S6 cm · 6 sizes
- Rider height
- 4'11"–6'8"
- Height (cm)
- 150–203 cm
- Stack / reach · S3
- 627 / 450 mm
Stumpjumper 15 Comp Alloy size finder
Which Stumpjumper 15 Comp Alloy 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 Stumpjumper 15 Comp Alloy 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 Stumpjumper 15 Comp Alloy size, 146 to 207 cm overall. S1: 150 to 160 cm. S2: 157 to 173 cm. S3: 165 to 180 cm. S4: 173 to 188 cm. S5: 178 to 193 cm. S6: 188 to 203 cm.
- S1150–160 cm
- S2157–173 cm
- S3165–180 cm
- S4173–188 cm
- S5178–193 cm
- S6188–203 cm
146 cm177 cm207 cm
Size chart
Stumpjumper 15 Comp Alloy size by height
Rider height is Specialized's published Stumpjumper S-Sizing chart. Specialized publishes no rider inseam for this family, so the table shows height only.
Size
Height
Height cm
Inseam
Fit note
S1
4'11"–5'3"
150–160 cm
–
Smallest S-Size and the lowest standover at 738 mm.
S2
5'2"–5'8"
157–173 cm
–
Shortest reach step in the ladder at 25 mm; Specialized sizes the T-shirt equivalent as S.
S3
5'5"–5'11"
165–180 cm
–
Most riders start here. Stack and reach above are for this size.
S4
5'8"–6'2"
173–188 cm
–
Same standover as S3, so stepping up here does not raise the frame you have to clear.
S5
5'10"–6'4"
178–193 cm
–
Same standover as S3 and S4; only the cockpit changes.
S6
6'2"–6'8"
188–203 cm
–
Tallest S-Size, with the highest standover at 751 mm.
S1
4'11"–5'3"
150–160 cm
Smallest S-Size and the lowest standover at 738 mm.
S2
5'2"–5'8"
157–173 cm
Shortest reach step in the ladder at 25 mm; Specialized sizes the T-shirt equivalent as S.
S3
5'5"–5'11"
165–180 cm
Most riders start here. Stack and reach above are for this size.
S4
5'8"–6'2"
173–188 cm
Same standover as S3, so stepping up here does not raise the frame you have to clear.
S5
5'10"–6'4"
178–193 cm
Same standover as S3 and S4; only the cockpit changes.
S6
6'2"–6'8"
188–203 cm
Tallest S-Size, with the highest standover at 751 mm.
Start with height. If two sizes overlap, use cycling inseam to choose.How to measure
Geometry
Stumpjumper 15 Comp Alloy geometry by size
Stack, reach, and standover for every Stumpjumper 15 S-Size, read from Specialized's geometry table on the Comp Alloy page. The `Reach (low)` row is the low geometry position.
Size
Height
Stack
Reach
Standover
S1
4'11"–5'3"
608 mm
400 mm
738 mm
S2
5'2"–5'8"
618 mm
425 mm
751 mm
S3
5'5"–5'11"
627 mm
450 mm
745 mm
S4
5'8"–6'2"
640 mm
475 mm
745 mm
S5
5'10"–6'4"
654 mm
500 mm
745 mm
S6
6'2"–6'8"
667 mm
530 mm
751 mm
S1
4'11"–5'3"
- Stack
- 608 mm
- Reach
- 400 mm
- Standover
- 738 mm
S2
5'2"–5'8"
- Stack
- 618 mm
- Reach
- 425 mm
- Standover
- 751 mm
S3
5'5"–5'11"
- Stack
- 627 mm
- Reach
- 450 mm
- Standover
- 745 mm
S4
5'8"–6'2"
- Stack
- 640 mm
- Reach
- 475 mm
- Standover
- 745 mm
S5
5'10"–6'4"
- Stack
- 654 mm
- Reach
- 500 mm
- Standover
- 745 mm
S6
6'2"–6'8"
- Stack
- 667 mm
- Reach
- 530 mm
- Standover
- 751 mm
S14'11"–5'3"
Stack608 mmReach400 mmS25'2"–5'8"
Stack618 mmReach425 mmS35'5"–5'11"
Stack627 mmReach450 mmS45'8"–6'2"
Stack640 mmReach475 mmS55'10"–6'4"
Stack654 mmReach500 mmS66'2"–6'8"
Stack667 mmReach530 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
- S1 → S2+10 mm+25 mm+13 mm
- S2 → S3+9 mm+25 mm-6 mm
- S3 → S4+13 mm+25 mm0 mm
- S4 → S5+14 mm+25 mm0 mm
- S5 → S6+13 mm+30 mm+6 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
View on AmazonPrice and availability on Amazon
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Bike size calculator
Find your Specialized Stumpjumper 15 Comp Alloy size
Enter your height and inseam for a Specialized mountain bike, then compare the result with this Stumpjumper 15 Comp Alloy 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
S-Sizing is a choice, not a ladder. 173 cm sits inside S2, S3 and S4 at once, and Specialized's own S-Sizing page says the smaller size is the more nimble one while the larger is the more stable one.
Standover barely moves across the range: 738 mm at S1, then 751, 745, 745, 745 and 751 mm. Reach and stack decide the size, not clearance.
Reach grows 130 mm from S1 to S6 while stack grows 59 mm, so stepping up lengthens the cockpit more than twice as fast as it raises the front end.
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 Stumpjumper 15 Comp Alloy against broader Specialized size guidance.
Mountain bike size chart
Check mountain sizing by height and inseam before choosing a frame.
Questions
Stumpjumper 15 Comp Alloy size chart FAQ
Short answers for Specialized Stumpjumper 15 Comp Alloy sizing.
What size Specialized Stumpjumper should I ride?
Start with the Specialized S-Sizing band: S1 for 150–160 cm, S2 for 157–173 cm, S3 for 165–180 cm, S4 for 173–188 cm, S5 for 178–193 cm, and S6 for 188–203 cm. Where two bands cover you, the smaller S-Size is the more nimble one and the larger is the more stable one.
What is S-Sizing on a Stumpjumper?
S-Sizing replaces frame letters with S1 to S6 and publishes wide, overlapping height bands. A rider is often covered by more than one S-Size, and Specialized's own guidance is to pick the smaller size for agility and the larger for stability.
What size Stumpjumper fits a 173 cm rider?
173 cm sits inside S2, S3 and S4 at once, the widest overlap in the ladder. S3 is the middle option with 627 mm of stack and 450 mm of reach; S2 is 25 mm shorter in reach and S4 is 25 mm longer.
Is a Stumpjumper S3 the same as a medium?
Specialized prints M beside S3 on the same chart, so S3 is the medium of the S-Sizing ladder. It carries 627 mm of stack, 450 mm of reach, and 745 mm of standover.
Does the Stumpjumper EVO use the same sizes?
Stumpjumper and Stumpjumper EVO share one S-Sizing chart, so the S1 to S6 bands carry across. The frames are different, so confirm stack, reach, and standover on the exact model before buying.