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Three speed STI shifter on two speed crankset

Bicycles Asked by Davide ND on September 28, 2021

I just bought old Shimano RSX STI shifters for my 90s road bike, which had a Shimano 600 Tricolor Group (2×7) with downtube shifters.
While the rear shifter I bought is correctly a 7 speed one, the front one is a 3 speed one. Is there any way to adapt it so it works on the 2 speed crankset and derailleur?

Thanks!

One Answer

Just set it up and adjust it as you would a two speed shifter. Make your initial adjustments using the first and second shift positions. The "HIGH LIMIT" screw on the front derailleur will prevent you from reaching the third shift point.

Correct answer by mikes on September 28, 2021

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