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mtbpete
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157 was designed to be easier. Many hub brands now are making hub end caps to convert 150 hubs to 157mm. What the 157 frame has is recesses in the dropout of the frame that are 3.5mm deep on each side, therefore adding to 157 total. So, instead of lining up the hub with the dropout holes in the frame the recesses or slots in the frame line up your 157 hub for easy installation.

This is the same concept as the 142 frames vs. the 135 thru axle frames.
 

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This is the same concept as the 142 frames vs. the 135 thru axle frames.
this. it's just an alignment feature for installing the wheel. It's really nice to have, but no way I'd let it sway me from one frame to another. One of my [142] frames came with spacers to let you use a 135mm axle; basically 12mm ID, matched the depth and OD of the alignment pockets. I don't see why you couldn't do something similar with 157-150.
 
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