CALIPER MOUNTING SPECIFICATIONS
GEN.0000000005232 Rev R © 2024 SRAM, LLC
MTB & Road Disc Brake
22
TABLE OF CONTENTS
Bolt Length Specification .............................................................................................3
Recommended Road Rotor Size and Brake Pad Material ........................................4
SRAM Caliper Type Identification ...............................................................................5
Fork Mount Identification .............................................................................................6
Frame Mount Identification .......................................................................................... 7
Flat Mount and Thru Bolt Standard .............................................................................8
Flat Mount and Thru Bolt Standard .............................................................................9
Post Mount Standard .................................................................................................. 10
Post Mount Standard ...................................................................................................11
Post Mount Standard .................................................................................................. 12
Post Mount Standard with CPS Washers ................................................................. 13
Post Mount Standard .................................................................................................. 14
International Standard Mount (IS) ............................................................................ 15
IS Standard ................................................................................................................... 16
For SRAM Trademark information, visit: www.sram.com/website-terms-of-use.
3
Bolt Length Specification
⚠⚠ WARNING
Choose the correct bolt length for proper thread engagement. Riding a
bike with improper bolt engagement can allow the brakes to disengage
from the bicycle, which can lead to a crash and serious injury or death to
the rider.
For forks and frames with thru bolt or flat mounts, with or without brackets,
there must be 5-7 mm of mounting bolt thread engagement when
mounting brake calipers.
For forks and frames with post mounts, with or without brackets and/
or spacers, there must be 9-13 mm of mounting bolt thread engagement
when mounting brake calipers.
9-13 mm
5-7 mm
Flat Mount Frame and Thru Bolt Fork
Bolts and brackets may need to be purchased separately.
Post Mount Fork
4
Riding Style
Cyclocross / Time Trial Road / Gravel- General Road / Gravel- Alpine
Organic or Sintered Organic Organic
System Weight¹
< 140 lbs (63 kg)
140 mm
140 mm
140 mm
140 - 160 lbs (63 - 73 kg) 140 mm / 160 mm
160 - 180 lbs (73 - 82 kg) 140 mm / 160 mm
160 mm180 - 200 lbs (82 - 91 kg) 140 mm / 160 mm
160 mm
200 - 240 lbs (91 - 109 kg) 160 mm
240-260 lbs (109-118 kg) 160 mm / 180 mm 160 mm / 180 mm 180 mm
260-280 lbs (118-127 kg) 180 mm 180 mm 180 mm
System weight includes the total weight of the bicycle, rider, and all the additional attached items.
X / Y show the recommended rotor size for rear and front use.
Consult the fork or frame manufacturer's specification before using a 140 or a 180 mm rotor. These rotor sizes have compatibility limitations on many
frames and forks.
Recommended Road Rotor Size and Brake Pad Material
All SRAM Road Hydraulic Brakes
5
Flat Mount
Flat Tab
The caliper has flat tabs and may need a
bracket to attach to the frame or fork.
Post Mount
Oset Tab
No CPS washers are needed between the
caliper and mount (unless otherwise specified).
+5 mm
Post Mount- Caliper Positioning System (CPS)
Inline Tab
CPS washers are needed between the caliper
and mount (unless otherwise specified).
SRAM Caliper Type Identification
6
Fork Mount Identification
Consult the fork manufacturer's instructions, or measure the distance
between the center of each bolt hole, to identify the fork mount.
Flat mount is 70 mm.
Post mount is 74 mm.
Thru bolt fork is 34 mm, and have bolt holes that go through the fork leg.
IS mount is 51 mm.
Flat Mount Fork Post Mount Fork
Thru Bolt Fork
70 mm
74 mm
34 mm
IS Mount Fork
51 mm
7
Frame Mount Identification
Flat Mount Frame Post Mount Frame
34
Chainstay Mount
Seatstay Mount
74
51
74
Consult the frame manufacturer's instructions, or measure the distance
between the center of each bolt hole, to identify the frame mount.
Flat mount is 34 mm.
Post mount is 74 mm.
IS mount is 51 mm.
IS Mount Frame
8
Measure from the centerline of the
bottom slot to the centerline of the axle.
Position the Front Flat Mount Bracket
to the 0 mm or the +20 mm orientation,
according to the chart.
Position the Front/Rear Flat Direct Mount
Bracket FD20 onto the frame or the Thru
Bolt, according to the chart.
Flat Mount and Thru Bolt Standard
Rotor and Mounting Configurations
Rotor Size
140 mm 160 mm 180 mm
Fork / Frame
Dimension A
23.5 mm
Front Flat Mount
Bracket F0 position
Front Flat Mount
Bracket F20 position
-
32 mm -
Front Flat Mount
Bracket F0 position
Front Flat Mount
Bracket F20 position
Dimension B
36.5 mm
Direct to frame or
thru bolt fork
Front/Rear Flat Direct
Mount Bracket FD20
-
45 mm -
Direct to frame or thru
bolt fork
Front/Rear Flat Direct
Mount Bracket FD20
Identify your frame or fork's mounting standard and the recommended rotor size, then use the chart to determine the appropriate mounting and hardware
configuration.
Rear
Use the charts on the following page to
install the correct hardware.
Measure from the centerline of the
bottom slot to the centerline of the axle.
.
Flat Mount and Thru Bolt Fork
Measure BracketsHardware
B
A B
Front Flat Mount Bracket F0/F20*
Front/Rear Flat Direct Mount
Bracket FD20
Flat Head Bolt
Washer
Button Head Bolt
*Some flat mount brackets have 140 mm
printed on the bracket for 0 mm, and 160 mm
printed on the bracket for +20 mm.
9
Upper
Button
Head Bolt
Lower
Button
Head Bolt
Flat Head
Bolt
Flat Head
Bolt
15 mm 15 mm 10.7 mm 10.7 mm
Front Flat Mount Bracket - F0
Front Flat Mount Bracket - F20
Upper
Button
Head Bolt
Lower
Button
Head Bolt
Flat Head
Bolt
Flat Head
Bolt
15 mm 15 mm 10.7 mm 10.7 mm
Flat Mount and Thru Bolt Standard
Flat Mount Caliper Configurations
Frame or
Fork Boss
Thickness
Button
Head
Bolts
10 mm 17 mm
15 mm 22 mm
20 mm 27 mm
25 mm 32 mm
30 mm 37 mm
35 mm 42 mm
40 mm 47 mm
Front / Rear Flat Direct Mount - FD0
Front / Rear Flat Direct Mount 20 mm Bracket - FD20
Frame or
Fork Boss
Thickness
Button
Head
Bolts
Flat
Head
Bolts
10 mm 17 mm 10.7 mm
15 mm 22 mm 10.7 mm
20 mm 27 mm 10.7 mm
25 mm 32 mm 10.7 mm
30 mm 37 mm 10.7 mm
35 mm 42 mm 10.7 mm
40 mm 47 mm 10.7 mm
MTB
Road
Level Ultimate
Level TLM
S-300
SRAM RED AXS HRD
SRAM FORCE AXS HRD
SRAM RIVAL AXS HRD
SRAM APEX AXS HRD
SRAM RED eTap AXS HRD
SRAM FORCE eTap AXS HRD
SRAM RIVAL eTap AXS HRD
SRAM RED eTap HRD
SRAM RED HRD
SRAM FORCE HRD
SRAM RIVAL HRD
SRAM APEX HRD
S-900 Aero HRD
*see chart on page 8
10
Post Mount Standard
Rotor and Mounting Configurations for an Offset Tab Caliper
Rotor Size
140 mm 160 mm 170 mm 180 mm 200 mm 203 mm 220 mm*
Fork / Frame
140 Post Direct
20 S
20 P-1
30 P 40 P - - -
160 Post - Direct 10 S
20 S
20 P-1
40 P - -
180 Post - - - Direct
20 S
20 P-2
40 P
200 Post - - - - Direct 3 S
20 S
20 P-2
203 Post - - - - - Direct 17 P**
* The 220 mm diameter rotor is designed for use with a 4-piston caliper.
** The 17P Post Bracket must be used with a 203 Post Fork or Frame that meets the SRAM Disc Brake Post Mount Specification in the
SRAM MTB Frame Fit Specifications on www.sram.com/service.
Identify your frame or fork's mounting standard and your preferred rotor size, then use the chart to determine the appropriate mounting configuration with
an offset tab caliper.
Direct Mount (Direct) Post Spacer (S) Post Bracket (P)**
No post bracket or spacer(s) are needed
to attach the caliper to the frame or fork.
Calipers with an Offset Tab do not need
CPS washers between the caliper and
mount, unless otherwise specified.
Some rotor sizes require the use of
spacer(s) to fit the caliper to the frame
or fork.
Some rotor sizes require the use of
a post bracket to fit the caliper to the
frame or fork.
Offset Tab
+5 mm
11
Post Mount Standard
Offset Tab Caliper Configurations
Upper
Bolt
Lower
Bolt
18 mm 18 mm
Direct*
Upper
Bolt
Upper
Spacer
Lower
Bolt
Lower
Spacer
20 mm 1.5 mm 20 mm 1.5 mm
3 S
Upper
Bolt
Upper
Spacer
Lower
Bolt
Lower
Spacer
24 mm 6 mm 24 mm 6 mm
10 S
Upper
Bolt
Bracket
Bolt
Lower
Bolt
Bracket
Bolt
18 mm 18 mm 18 mm 18 mm
17 P
Upper
Bolt
Lower
Bolt
39.5 mm 34 mm
20 P (Pre-2024)
Upper
Bolt
Upper
Spacer
Lower
Bolt
Lower
Spacer
39.5 mm 12.5 mm 34 mm 7.5 mm
20 S
12mm
12mm
10mm
10mm
MTB
Road
G2
Guide
Level
DB
XX
X0
CODE 2017+
Elixir 2013+
Maven*
SRAM RED eTap AXS HRD
SRAM RED eTap HRD
SRAM RED HRD
SRAM FORCE HRD
SRAM RIVAL HRD
SRAM APEX HRD
SRAM S-700
12
Post Mount Standard
Offset Tab Caliper Configurations
Upper
Bolt
Bracket
Bolt
Lower
Bolt
Bracket
Bolt
18 mm 18 mm 18 mm 18 mm
Upper
Bolt
Bracket
Bolt
Lower
Bolt
Bracket
Bolt
18 mm 18 mm 18 mm 18 mm
Upper
Bolt
Bracket
Bolt
Lower
Bolt
Bracket
Bolt
18 mm 18 mm 18 mm 18 mm
40 P
Upper
Bolt
Lower
Bolt
46 mm 39.5 mm
30 P
20 P-1 20 P-2
12mm
12mm
10mm
10mm
12mm
12mm
10mm
10mm
12mm
12mm
10mm
10mm
MTB
Road
G2
Guide
Level
DB
XX
X0
CODE 2017+
Elixir 2013+
Maven
SRAM RED eTap AXS HRD
SRAM RED eTap HRD
SRAM RED HRD
SRAM FORCE HRD
SRAM RIVAL HRD
SRAM APEX HRD
SRAM S-700
13
Major Section Title - Shift+Ctrl Click to unlock and edit text
Supplemental Text
Post Mount Standard with CPS Washers
Rotor and Mounting Configurations for Inline Tab Caliper
Rotor Size
140 mm 160 mm 170 mm 180 mm 185 mm 200 mm 203 mm 220 mm*
Fork / Frame
140 Post Direct
20 S
20 P
30 P 40 P - - - -
160 Post - Direct 10 S
20 S
20 P
25 S 40 P - -
180 Post - - - Direct -
20 S
20 P
40 P
200 Post - - - - - Direct 3 S
20 S
20 P
203 Post - - - - - - Direct 17 P
* The 220 mm diameter rotor is designed for use with a 4-piston caliper.
Identify your frame or fork's mounting standard and your preferred rotor size, then use the chart to determine the appropriate mounting configuration to use
with an Inline Tab caliper.
HardwareInline Tab
Convex Washer
Concave Washer
Washer
Button Head Bolt
An Inline tab caliper needs CPS washers
between the caliper and mount, unless
otherwise specified.
14
Upper
Bolt
Lower
Bolt
29 mm 29 mm
Direct
Upper
Bolt
Upper
Spacer
Lower
Bolt
Lower
Spacer
39.5 mm 12.5 mm 34 mm 7.5 mm
10 S
Upper
Bolt
Lower
Bolt
44 mm 39.5 mm
20 P
Upper
Bolt
Upper
Spacer
Lower
Bolt
Lower
Spacer
44 mm 17.5 mm 39.5 mm 12.5 mm
20 S
Upper
Bolt
Upper
Spacer
Lower
Bolt
Lower
Spacer
46 mm 20.5 mm 40.5 mm 15 mm
25 S
Upper
Bolt
Lower
Bolt
50 mm 44 mm
30 P
Post Mount Standard
Inline Tab CPS Caliper Configurations
MTB
Guide RE
CODE Pre-2017
CODE R Pre-2017
Elixir Pre-2013
Juicy
BB7
BB5
BB3
BB7 Road
BB5 Road
Road
Upper
Bolt
Bracket
Bolt
Lower
Bolt
Bracket
Bolt
29 mm 18 mm 29 mm 18 mm
40 P
12mm
12mm
10mm
10mm
15
Major Section Title - Shift+Ctrl Click to unlock and edit text
Supplemental Text
International Standard Mount (IS)
Rotor and Mounting Configurations
Identify your frame or fork's mounting standard and your preferred rotor size, then use the chart to determine the appropriate mounting configuration.
IS Bracket
To use a Post Mount caliper or a CPS
Caliper on a IS frame or fork, you must
use an IS bracket.
Rotor Size
140 mm 160 mm 170 mm 180 mm 185 mm 200 mm 203 mm 220 mm*
Fork / Frame
140 IS 0 IS 20 IS 30 IS 40 IS 45 IS 60 IS - -
160 IS - 0 IS - 20 IS 25 IS 40 IS - 60 IS
* The 220 mm diameter rotor is designed for use with a 4-piston caliper.
16
Major Section Title - Shift+Ctrl Click to unlock and edit text
Supplemental Text
Upper
Bolt
Lower
Bolt
18 mm 18 mm
IS to Post Mount Caliper
Upper
Bolt
Lower
Bolt
29 mm 29 mm
IS to CPS Caliper
IS Standard
Offset Tab and Inline Tab Caliper Configurations
MTB
Road
G2
Guide
Level
DB
XX
X0
CODE 2017+
Elixir 2013+
SRAM RED eTap AXS HRD
SRAM RED eTap HRD
SRAM RED HRD
SRAM FORCE HRD
SRAM RIVAL HRD
SRAM APEX HRD
SRAM S-700
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Taiwan
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