Isn't back pain more likely to be to do with your riding position?
+1
A longer saddle would let you adjust position occasionally though, this could help. A suspension seatpost would better absorb bumps then a spring saddle (IMO).
@Smallfurry started
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+1
A longer saddle would let you adjust position occasionally though, this could help.
A suspension seatpost would better absorb bumps then a spring saddle (IMO).