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5
4. SPECIFICATIONS
4.1. GENERAL SPECIFICATIONS
ITEM PART # SPECIFICATION
HEADSET
S182500005 1 1/8” UPPER / 1.5” LOWER DROP-IN BEARINGS
SEAT COLLAR DIAMETER S184700004 38.6mm
SEATPOST DIAMETER
34.9mm
DERAILLEUR HANGER
S172600001 HGR MY18 MTB THRU AXLE DER HANGER
BOTTOM BRACKET SHELL BSA THREADED 73mm
CHAINGUIDE TABS ISCG05 (two-bolt mounting only)
REAR HUB SPACING S170200003 AXL MY17 EPIC HT THRU-AXLE 148mm X 12mm
The specs below are the stock configurations for each model.
MODEL
WHEEL /
TIRE
SHOCK
TRAVEL
SHOCK
EXTENSION
1
SHOCK
STROKE
FORK
TRAVEL
BB
HEIGHT
1
HEAD TUBE
ANGLE
1
SJ 29 ST 29 x 2.3 120
115 / 118
190 x 42.5 130
333 / 338 67.5 / 68
SJ 27.5 ST
27.5 x 2.3 130
115 / 118
190 x 45 130
325 / 331 66.5 / 67
SJ 29 29 x 2.6 140
95 / 98
210 x 50 150
342 / 347 66.5 / 67
SJ 27.5 27.5 x 2.6 150
95 / 98
210 x 52.5 150
336 / 342 65.5 / 66
1
The shock extension length, bottom bracket (BB) height and head tube angle all have two settings based on the
Flip Chip position. The stock configuration for the Flip Chip is in the lower position (highlighted in BOLD). Refer to
section 2.6 for information about adjusting the Flip Chip.
4.2. FRAME/BIKE CUSTOMIZATION:
Stumpjumper FSR frames are available in two frame types (29” or 27.5”), each of which is available in two stock
configurations (SJ ST and SJ), with different wheel/tire, shock, shock extension and/or fork options. Each of these
variables will affect the bottom bracket height and head angle of the frame, as well as the general ride characteristics of
the bike. If you decide to make changes to the stock configuration, e.g. changing to from SJ to SJ ST or changing the tire
size, please check with your Authorized Specialized Retailer what components, if any, need to change for compatibility.
WARNING! Changing the frame configuration can alter the BB height and/or the head tube angle,
which can have negative effects on the bike’s handling characteristics and ride quality. In certain
cases, it can also result in frame/shock incompatibility. Please refer to your Authorized Specialized
Retailer before making any modifications to the wheel/tire size, shock, shock extension and/or
fork length.
MAXIMUM FORK LENGTH AND TIRE SIZE:
WHEEL SIZE MAX FORK TRAVEL MAX REAR TIRE SIZE CHAINRING SIZE
29” 150mm 27.5 x 3.0 or 29 x 2.6 28
2
- 36t
27.5” 160mm 27.5 x 3.0 28
2
- 36t
WARNING! Specialized frames are compatible ONLY with forks that have a specific range of travel
(see tables). Use of different styled forks or forks with longer travel may result in catastrophic
failure of the frame which may result in serious personal injury or death.
2
28t chainring: Any potential contact between the chain and the protector generally goes away
when the chain is under tension and the suspension is at the recommended sag.
8


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