I've used a few Hamax Sleepy seats to the seat tube. Easy to remove, set it 120mm from tyre to underside of the seat and match the target crosshairs vertically to the back axle.
@Shandoom started
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I've used a few Hamax Sleepy seats to the seat tube. Easy to remove, set it 120mm from tyre to underside of the seat and match the target crosshairs vertically to the back axle.