Shimano TT Basebar Grip is specifically designed for Shimano Dura-Ace ST-R9180 levers.
Designed to reduce flow separation of the back of Shimano Dura-Ace ST-R9180 brake levers, whilst also improving comfort and grip on the basebar.
Key Features:
Available in three sizes: Specific to your bike’s basebar grip diameter.

Not sure what size you need?
If you have one of the following bikes with the stock base bar supplied with that model, then this is the size you will need:
| Basebar Grip Diameter: | Bike: |
| Ø 22.7mm | Scott Plasma 6 |
| Ø 24mm |
Cervélo P5, Trek Speed Concept, Giant Trinity, BMC Speedmachine, Ordea Ordu, Van Rysel XCR |
| Ø 25mm | S-Works Shiv |
Please note we do not fit oval basebars.
If your basebars don’t match, please size up to the nearest half. i.e. if your bar measures 23.7mm, please select 24mm.
If your bike is not on that list, please measure your basebar with one of the following methods:
| Circumference of basebar: | Base bar grip size: |
| 71.3 mm | 22.7 mm |
| 75.4 mm | 24 mm |
| 78.5 mm | 25 mm |
If you have any further questions, please let us know at info@drag2zero.com or Tel: +44 (0)1295 236115



Please note our last posting date for UK orders is
Monday 22 December.
For orders being sent outside UK it will be Friday 19 December. If you would like your order to arrive before Christmas then please order soon and place a note on your order.
Any orders made after the above dates will be sent w/c
5 January 2026.
We’d like to thank you for your custom and wish you all a very
happy and healthy Christmas and New Year.