Stelvio Ultegra SL
Frame Size Extra Small (50) Small (53) Medium (55) Large (58) Extra Large (61)
Effective Top Tube (cm) 52.3 53.4 54.9 57 59
Actual Top Tube (cm) 51.5 52.5 54.1 56 58.2
Standover Height (cm) 75.7 77.4 78.9 80.9 82.3
Wheelbase (cm) 97.2 97.9 98.5 99.5 101
Chain Stay (cm) 40.6 40.6 40.6 40.6 40.6
Head Tube Length (cm) 12.5 14.5 16 18 20
Head Tube Angle (degree) 72 72 72.5 73 73.5
Seat Tube Angle (degree) 74.5 74 73.5 73 73

Argenta / Trevisio / Venizia / Portofino
Frame Size Extra Small (52) Small (54) Medium (56) Large (58) Extra Large (61)
Effective Top Tube (cm) 52 53.5 54.4 55.2 57.2
Actual Top Tube (cm) 50.5 52.1 52.8 53.6 55.5
Standover Height (cm) 74.5 77 79.1 81.2 84.4
Wheelbase (cm) 99.4 100.2 100.5 100.6 101.2
Chain Stay (cm) 41.5 41.5 41.5 41.5 41.5
Head Tube Length (cm) 13.5 15.5 17 18.5 21.5
Head Tube Angle (degree) 71.5 72 72 72 73
Seat Tube Angle (degree) 75 75 74 73 73

Mill Valley / Lucas Valley / Fairfax / Terra Linda
Frame Size 15 17 19 20.5 22
Effective Top Tube (cm) 54.3 55.6 57 59 60.1
Actual Top Tube (cm) 52.6 53.7 55.1 57.2 58.4
Standover Height (cm) 71.4 74.4 77.7 81.1 84.5
Wheelbase (cm) 103.4 103.8 104.4 106.5 107.7
Chain Stay (cm) 42.5 42.5 42.5 42.5 42.5
Head Tube Length (cm) 11.5 12.5 14.5 17.5 20.5
Head Tube Angle (degree) 70.5 71 71 71 71
Seat Tube Angle (degree) 74.5 74 73 73 73

*Measurements stated in inches unless otherwise indicated.


Frame Size 50 54 56 58 62
Effective Top Tube (cm) 54 55 56.5 58.5 62
Actual Top Tube (cm) 52.7 54.2 55.3 56.3 60.6
Standover Height (cm) UA UA UA UA UA
Wheelbase (cm) 102.6 103.2 103.2 104.1 106.4
Chain Stay (cm) 43.5 43.5 43.5 43.5 43.5
Head Tube Length (cm) 11.5 12.5 15 17 20
Head Tube Angle (degree) 71 71.5 72 72 73
Seat Tube Angle (degree) 74 74 73 72 72

*Measurements stated in inches unless otherwise indicated.


How to Size Your Bike

  1. With shoes on, measure from your crotch to the floor. This gives you your inseam length.
  2. Find the stand-over height on the bicycle sizing chart ("A" in the illustration at right).
  3. For mountain, touring, urban and comfort bikes, the difference between your inseam length and the stand-over height should be around 2 inches; for road bikes, this difference should be around 1 inch.