Schwalbe Road Cruiser Mountain Tire 27''x1-1/4 Wire GreenCompound K-Guard 50TPI Gumwall MFPN=IFCM81301EXXT The Melvin uses two pulleys

The Melvin uses two pulleys just like a rear derailleur which gives it 20 teeth of chain wrap

}Hope Fatsno Pro 4 Rear Hub - 12 x 197mm 6-Bolt XD Purple 32H

}DT Swiss 350 Rear Hub - 12 x 197mm 6-Bolt HG11 MTN Black 32H 36pt

Crank Spindle Diameter 24mm BB Shell Type BB30

28mm max tire size

Schwalbe Road Cruiser Mountain Tire 27''x1-1/4 Wire GreenCompound K-Guard 50TPI Gumwall MFPN=IFCM81301EXXT The Melvin uses two pulleysPart of Schwalbes active line of tires, the Road Cruiser is the perfect tire for exactly that, cruising down the road K Guard protection adds a Kevlar reinforced layer under the tread to help prevent punctures A reflective stripe on the sidewall enhances visibility in lowlight situations to increase safety TECH SPECS e Bike approved No Tire Compound GreenCompound Bead Wire Tire Type Clincher Tire Width 1 1 4 Tire Width Range 1 1 1 2 TPI 50TPI Primary