Contains: front +rear wheels ,rim tape,skewers, cassette spacer
Matieral: alloy rims + aluminum hubs
Rims: SR42 ,42mm,SILVEROCK
Spokes: Sapim or Pilar
Nipples: brass black
Hub: 6pawls ,2/4 JAPAN NBK bearing ,noise sound; Front 16H jump holes or 24holes ,rear 24Holes
Hub: Front 100mm, special for BIRDY, rear 135mm
Weight:: appro 1624g/set( 24holes), 1568g/(16 jump holes)
Fits for 20in 406 type ,suggest max tyre clearance 20x1.75.
Some birdy folding bikes is 100 /135mm
Origin: Made in China, build by SILVEROCK
