EDIT:To clarify, on one bike I have SRAM 500 TT bar end shifters (not sure if the left is indexed, I’ve never used it)
SRAM TT500 front shifter should have a friction option I believe:
SRAM TT500 Front Friction Bar End Shifter
https://www.utahtrikes.com/PROD-11618212.html
@Tijs started
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SRAM TT500 front shifter should have a friction option I believe:
https://www.utahtrikes.com/PROD-11618212.html