We’re long-time fans of Kona’s Cowan grip, and finally a lock-on version is available. They combine a very soft compound rubber, which is grippy wet or dry, with a thin profile and an extra long 125mm of usable grip.
The large flange is great for dirt jumpers, and is soft enough to deform, so as not to interfere with trigger shifters.
However, the soft compound is a trade-off with durability, and the four grub-screw locking system is not as secure as a ring lock.
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