Titanium seatpost clamp bolt assemblies for Specialized Tarmac SL7 and SL8.
Choose RT152 for SL7 or RT153 for SL8, in Rainbow, Gold or Black.
Both models use an M5 x 29 mm thread and a T25 Torx drive.
Titanium seatpost clamp bolt assemblies for Specialized Tarmac SL7 and SL8. Choose RT152 for SL7 or RT153 for SL8, in Rainbow, Gold or Black. Both models use an M5 x 29 mm thread and a T25 Torx drive.
| Model | Compatibility | Cross nut dimensions | Approx. net weight |
|---|---|---|---|
| RT152 | Specialized Tarmac SL7 | 8 mm wide x 5.5 mm high | 3.5 g |
| RT153 | Specialized Tarmac SL8 | 10 mm wide x 6 mm high | 3.9 g |
Both models have an M5 x 29 mm thread, a T25 Torx drive and an overall length of 32.5 mm as shown in the dimension drawings. RT152 and RT153 have different cross nut dimensions; compare the original assembly with the detail images to select the correct model.
RT152-1 / RT153-1: Rainbow.
RT152-2 / RT153-2: Gold.
RT152-3 / RT153-3: Black.
Select RT152 for the Tarmac SL7 or RT153 for the Tarmac SL8 before choosing the finish.
Use a T25 Torx tool and tighten to the torque specified in the original component manual. Match the replacement assembly to the original clamp before installation.
One selected bolt assembly per bag. Approximate packed weight is 7.6 g for RT152 or 8 g for RT153. Frames, seatposts and clamp bodies shown in demonstrations are not included. Dimensions and weights are approximate.

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