Uni size 46-50cm

even the aero post on that TT bike you bought 3 years ago when you were talked into doing your local triathlon by some mates)

6mm Chainring bolts needed

but there are no axle conversion kits available at this stage

BikeYoke Revive Upper Tube Unit - Black - 30.9/31.6mm - 160mm PDP|PLP|Suits Freehub Type Uni size 46-50cmIncludes: 1x upper tube REVIVE seatpost compatible with: REVIVE REVIVE 2. 0 REVIVE 3. 0 NOTE: If the two piece tube of the REVIVE is replaced with a new one piece upper tube, the new reset unit must also be installed. The reset unit of the two piece tube is not compatible with the one piece tube. 1 x Wiper 1 x Upper Bushing 1 x Lower Seat Post Tube This set includes a complete lower tube unit with installed bushing and wiper. 30. 9 31. 6 are