How to choose BlackLock
Always double check compatibility measuring your original axle dimensions.
Thread Pitch Check
Simple method to check the thread pitch of your axle with a common vernier caliper.
Measure the total width of 4 thread "roots" as follows:
Align caliper "jaws" with the "first" and with the "fifth" crests (4 roots).
Total width 4mm --> thread pitch 1mm
Total width 5mm --> thread pitch 1.25mm
Total width 6mm --> thread pitch 1.5mm
|
Model
|
Compatibility
|
Head type
|
A
Total length |
B
Thread length |
C & D
Thread pitch and diameter |
Weight
|
|
Front Axles 12mm
|
|
|||||
|
BlackLock 12.5
|
Road forks 120mm |
Flat*
|
120
|
12.5
|
M12x1.5
|
20g
|
|
BlackLock 12.5 A
|
Road forks 116mm |
Flat*
|
116
|
12.5
|
M12x1.5
|
19g
|
|
BlackLock 12.5 B
|
Road forks 125mm |
Flat*
|
125
|
14
|
M12x1.5
|
21g
|
|
BlackLock 12.5 E
|
Trek Emonda fork |
Flat*
|
122
|
12
|
M12x1.75
|
20.5g
|
|
BlackLock 12.5 F
|
Road forks 120mm x1 |
Flat*
|
120
|
12.5
|
M12x1
|
20g
|
|
BlackLock 12.5 G
|
Specalized, conical, 114mm x1 |
Conical *
|
114
|
12.5
|
M12x1
|
19g
|
|
Front Axles 15mm
|
||||||
|
BlackLock 15.1
|
DT-Swiss XMM29' (Torsion Box models only) |
Flat*
|
143
|
9
|
M15x1.5
|
25g
|
|
BlackLock 15.2 (Discontinued)
|
DT-Swiss XMM29' (All models) |
Flat*
|
143
|
16
|
M15x1.5
|
26.4g
|
|
BlackLock 15.3
|
Fox |
Flat*
|
146
|
14
|
M14x1.5
|
26.4g
|
|
BlackLock 15.3 B
|
Fox Boost 110 |
Flat*
|
156
|
14
|
M14x1.5
|
28g
|
|
BlackLock 15.4
|
Rock Shox Sid / Sid Ultimate 2021 / Reba / RS1 |
Flat*
|
147
|
12
|
M15x1.5
|
26.7g
|
|
BlackLock 15.4 B
|
Rock Shox Boost 110 (not for Sid Ultimate 2021) |
Flat*
|
156
|
12
|
M15x1.5
|
29g
|
|
BlackLock 15.5A 129mm
|
Magura |
Conical *
|
129
|
11
|
M15x1
|
26g
|
|
BlackLock 15.5B 139mm
|
Magura |
Conical *
|
139
|
11
|
M15x1
|
27g
|
|
|
||||||
|
Rear Axles
|
|
|
|
|
|
|
|
BlackLock 12.1
|
Shimano E-Thru |
Flat*
|
172
|
18
|
M12x1.5
|
29g
|
|
BlackLock 12.1 B
|
Shimano E-Thru Boost |
Flat*
|
178
|
18
|
M12x1.5
|
31g
|
|
BlackLock 12.2
|
Specialized Road & MTB, 142mm only |
Conical *
|
160
|
17
|
M12x1
|
29g
|
|
BlackLock 12.2 B
|
Specialized Boost 148mm only |
Conical *
|
166
|
17
|
M12x1
|
31g
|
|
BlackLock 12.3
|
Maxle |
Flat*
|
176
|
19
|
M12x1.75
|
30g
|
|
BlackLock 12.3 B
|
Maxle "Boost" |
Flat*
|
182
|
20
|
M12x1.75
|
30g
|
|
BlackLock 12.4 (Discontinued)
|
Scott, etc (not compatible with Santa Cruz) |
Flat*
|
168
|
17
|
M12x1
|
29g
|
|
BlackLock 12.4 B
|
Scott Boost pre-'22, Cannondale F-si 2019 |
Flat*
|
172
|
17
|
M12x1
|
29g
|
|
BlackLock 12.4 C
|
Scott Spark from-2022 |
Flat*
|
178
|
13.5
|
M12x1
|
30g
|
|
BlackLock 12.4 RA
|
Scott Road pre-2020 |
Flat*
|
158
|
13
|
M12x1.5
|
27g
|
|
BlackLock 12.4 RB
|
Giant Road |
Flat*
|
163
|
13
|
M12x1.5
|
28g
|
|
BlackLock 12.4 RC
|
Scott Road 2020 |
Flat*
|
168
|
13
|
M12x1.5
|
29g
|
|
BlackLock 12.4 RE
|
Trek Emonda |
Flat*
|
166
|
19
|
M12x1.75
|
28g
|
|
BlackLock 12.6
|
Sram UDH derailleur (TopFuel/Orbea etc.) |
Flat*
|
185
|
15
|
M12x1
|
31g
|
* Length measure does't include head (Flat or Conical).