Custom bicycle

I wrote to a bicycle store and this is the answer that I got.  I will have to stick with the standard 3 ring setup in the front crankshaft.

Most bikes will come with the 3 rings up front, you typically don’t get a wide enough range of gears by having only a small ring up front. Also when the chain is in the smallest rear cog it puts a lot of angle on it and tends to not run as smooth. You could just get a standard 27spd bike & just choose to use whichever gears you like & ignore the others. There is no advantage to pulling them off.

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