There's a specialized toupe that are as wide as 155mm, right at your peak.
however it's varies on your position, the more aerodynamic (i.e. lower handlebar) the narrower your sit bones be.
@edscoble started
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There's a specialized toupe that are as wide as 155mm, right at your peak.
however it's varies on your position, the more aerodynamic (i.e. lower handlebar) the narrower your sit bones be.