Normal
https://www.velonews.com/2019/05/bikes-and-tech/gear-issue-friction-differences-between-1x-and-2x-drivetrains_493185?fbclid=IwAR2pw6No3D0GA3RHgHybxDiSNGorO5oCASKcS7lEWfhVRchnHrHtRys-7_wMonocorona e watt
https://www.velonews.com/2019/05/bikes-and-tech/gear-issue-friction-differences-between-1x-and-2x-drivetrains_493185?fbclid=IwAR2pw6No3D0GA3RHgHybxDiSNGorO5oCASKcS7lEWfhVRchnHrHtRys-7_w
Monocorona e watt