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Old 10-07-15, 04:53 AM
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You can go as low as a 24 tooth on a 130/74 bcd crank. That means you'll get a 15 tooth drop from the middle chain ring to the small (from a 39 to a 24) which is tough for a lot of front derailleurs to handle. I picked up a 2009 fuji touring bike recently that came stock with a 130/74 bcd crank and I'm going to swap it out before I go touring with that bike.

Shimano has done a poor job in recent years of providing gear for touring cyclists which tells you that touring is a small piece of the market.

The deore trekking crank is a better choice for touring than a road triple.

The deore 9 speed rear derailleur is a better choice for touring than a ultegra/105/tiagra long cage rear.
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