Okay so you can buy a totally new axle and change it out. I'm sure this is not recommended by sram and also doesn't help if Seafish has GXP which hopefully they do considering BSA frame
It would do wonders for your chainline
@Howard started
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Okay so you can buy a totally new axle and change it out. I'm sure this is not recommended by sram and also doesn't help if Seafish has GXP which hopefully they do considering BSA frame