Tandem Bike Geometry

Calfee Tandem Road Frame Geometry

Captain Stoker
Sizes Size Top Tube Seat Angle Stand- over Ht. Front Center Head Tube Length Size Stand- over Ht. Seat Angle Boom Tube
Small/Small 50 53 74 76 57.5* 10 46 70.5 74 72
Medium/Small 54 55 74 79 59.7* 12 46 75 74 72
Large/Small 58 57 73 82 60.6 16 46 74.3 74 72
Large/Medium 58 57 73 83 60.6 16 54 78.5 73 72
XLarge/Small 62 60 73 83 63.6 18 48 75.5 73 72
XL/Medium 62 60 73 83.5 63.6 18 54 79 73 72

*These sizes may have toe overlap, depending on shoe size and crank arm length.
When comparing our frames with your current frame, use the stand over height and top tube length for comparison.

Calfee Tandem Off-Road Frame Geometry – Full Suspension

Captain Stoker
Sizes Size Top Tube Seat Angle Stand- over Ht. Front Center Head Tube Length Size Stand- over Ht. Seat Angle Boom Tube
Small/Small 45 58.4 73.5 79.7 67.9 12 40 74.9 73.5 72.5
Medium/Small 48 60.5 73.5 82.5 69.6 12 40 76.2 73.5 72.5
Large/Small 51 63.5 73 86 71.9 15 40 76.7 73.5 72.1
Large/Medium 51 63.5 73 86.5 71.7 15 43 78.3 73.5 72.1
XLarge/Medium 54 66 73 89.2 73.3 18 43 79.6 73.5 72.1

All frames have 36.8cm (14 1/2″) bottom bracket ht, 43cm (17″ chainstays)
Wheel/tire size of this chart: 27.5(650B) wheel size with 2.25″ (57mm) tire.

Calfee Tandem Off-Road Frame Geometry – Front Suspension

Captain Stoker
Sizes Size Top Tube Seat Angle Stand- over Ht. Front Center Head Tube Length Size Stand- over Ht. Seat Angle Boom Tube
Small/Small 45 58.4 73.5 78.1 66.8 12 40 69.7 73.5 72.5
Medium/Small 48 60.5 73.5 80.5 68.5 12 40 71.2 73.5 72.5
Large/Small 51 63.5 73 84.2 70.6 15 40 72.7 73.5 72.1
Large/Medium 51 63.5 73 84.2 70.6 15 43 74.2 73.5 72.1
XLarge/Medium 54 66 73 87.5 72.6 18 43 75.7 73.5 72.1

All frames have 33cm (13″) bottom bracket ht, 43cm (17″ chainstays)
Wheel/tire size of this chart: 27.5(650B) wheel size with 2.25″ (57mm) tire.

Single Bike Geometry

Manta Pro Geometry

Size* top tube length seat angle chainstay length stand over height b.b. drop head tube angle head tube length Stack Reach wheel base
50 52.5 74 41.5 75.4 7 72.5 11.0 52.3 37.4 97.3
52 53.5 74 41.5 76.7 7 73 12.0 53.4 38.1 97.9
54 54.8 73.5 41.5 77.2 7 73 14 55.3 38.2 98.8
56 56 73 41.5 81.1 7 73.5 16.0 58.4 38.2 99.3
58 57 73 41.5 81.5 7 74.0 18.0 59.5 38.9 99.3
60 58.3 72.5 41.5 82.0 7 74.0 20.0 61.5 39.1 99.8
62 60 72.5 41.5 82.8 7 73.5 21.0 62.2 40.5 102.3
64 61 72 41.5 86.4 7 73 23.0 63.9 40.3 103.3
66 61.5 72 41.5 86.7 7 73 24.0 64.9 40.5 103.8
68 63 72 41.5 87.7 7 72.5 25.0 65.8 41.7 105.3

Dragonfly, Tetra, Luna, Bamboo Pro 44 Geometry (44mm head tube)

Size* top tube length seat angle chainstay length stand over height b.b. drop head tube angle head tube length Stack Reach wheel base
48 51.5 74.5 41.5 74.8 7 72 10 51.0 37.2 97.2
50 52.3 74 41.5 76.2 7 72.5 11.3 52.4 37.2 97.1
52 53.5 74 41.5 78.1 7 73 12.8 54.0 39.2 97.9
54 54.8 73.5 41.5 78.8 7 73 14 55.2 38.4 98.5
56 56 73 41.5 80.1 7 73.5 16.0 57.3 38.5 98.8
58 57 73 41.5 81.6 7 73.5 18.0 59.2 39.0 99.8
60 58.3 72.5 41.5 84.2 7 73.5 20.0 61.1 39.1 100.5
62 60 72.5 41.5 85.3 7 73.5 22.0 63.0 40.3 102.2
64 61 72 41.5 86.8 7 73 23.0 63.8 40.5 103.1
66 61.5 72 41.5 87.7 7 73 24.0 64.7 40.5 103.8
68 63 72 41.5 88.2 7 73 25.0 65.7 41.8 103.8

*Frame size is measured from center of bottom bracket to bottom of binder.
Check standover height(ground to top of top tube) to be sure of proper fit.
Allow 1 to 2cm clearance to crotch. Click here for frame measurement terms.

*46 cm frames are not available.  Please refer to the traditional model type for options.

Manta, Dragonfly, Tetra, Luna, Bamboo Adventure/CX Geometry

Size* top tube length seat angle chainstay length stand over height b.b. drop head tube angle head tube length Stack Reach wheel base
48 51.5 74.5 43.0 75.6 7 71.5 10.0 53.4 36.5 99.9
50 52.5 74.5 43.0 76.3 7 72.0 10.0 53.6 37.5 100.5
52 53.1 74 43.0 78.3 7 72.0 12.0 55.5 37.0 100.6
54 55 73.5 43.0 79.2 7 72.5 13.0 56.6 38.1 101.6
56 57.2 73 43.0 81.2 7 72.5 15.0 58.5 38.7 102.9
58 57.7 73 43.0 82.1 7 72.5 16.0 59.5 39.5 103.9
60 58.6 72.5 43.0 85.2 7 72.5 18.0 61.4 39.2 104.3
62 59.3 72.5 43.0 85.6 7 72.5 20.0 63.3 39.1 104.7
64 61.3 72 43.0 87.6 7 72.5 22.0 65.2 40.2 106.4
66 63.6 71.5 43.0 88.9 7 73 24.0 67.3 41.3 107.6

*Frame size is measured from center of bottom bracket to bottom of binder.
Check standover height(ground to top of top tube) to be sure of proper fit.
Allow 1 to 2cm clearance to crotch. Click here for frame measurement terms.

*46 cm frames are not available.

Dragonfly, Tetra, Luna, Bamboo Pro Geometry (Classic Models)

Size* top tube length seat tube angle set back chainstay length stand over height b.b. drop head tube angle head tube length Stack Reach wheel base
46 ** 50 75 11.9 39 71.5 4 72 9.1 N/A N/A 93.4
48 51.5 74.5 12.7 41.5 74.0 7 72 9.1 50.5 37.3 97.0
50 52.5 74.5 13.4 41.5 76.2 7 72.5 10.0 51.5 38.2 97.1
52 53 74 14.3 41.5 77.4 7 73 11.3 52.7 37.8 97.2
54 54.8 73.5 15.3 41.5 79 7 73 12.8 54.2 38.7 98.0
56 56 73 16.4 41.5 81.3 7 73.5 15.0 56.3 38.8 98.8
58 57 73 17.0 41.5 82.3 7 74 16.0 57.2 39.5 99.4
60 58.3 72.5 18.0 41.5 84.4 7 74 18.0 59.1 39.7 100.0
62 60 72.25 19.0 41.5 85.8 7 74 20.0 61.1 40.7 101.0
64 61 72 19.8 41.5 87.3 7 74 22.0 63.0 40.7 102.0
66 63.3 71.5 20.8 41.5 88.0 7 74 24.0 64.9 42.2 104.3

*Frame size is measured from center of bottom bracket to bottom of binder.
Check standover height(ground to top of top tube) to be sure of proper fit.
Allow 1 to 2cm clearance to crotch. Click here for frame measurement terms.

**46 cm frames use 650 c wheels

Bamboo Mountain Geometry

Size Wheel size Nominal
Size
Effective top tube length Stand over height Seat tube angle Head tube angle Wheelbase Head tube length
Extra Small 26” 13” (38.6cm)* 20” (50.7cm) 28.4” (72cm) 74 70 99 3.58” (9 cm)
Small 26” 14″ (40cm)* 21.25” (54cm) 29” (74cm) 73.5 71 101.7 3.58” (9 cm)
Small 27.5 27.5/650b” 14” (40cm)* 21.25” (54cm) 30” (76.5cm) 73.5 71 105.3 3.58” (9 cm)
Medium 26” 16” (44cm)* 22” (56cm) 29.5” (75cm) 73 71 104 3.93” (10 cm)
Medium 27.5 27.5/650b” 16” (42.6cm)* 22” (56cm) 30.5” (77.5cm) 73 71 107 3.93” (10 cm)
Medium 29 29” 16” (45cm)* 22” (56cm) 31.5” (80cm) 73 71 110 3.58” (9 cm)
Large 26” 18” (51cm)* 22.7” (57.7cm) 31” (78.7cm) 73 71 105.5 5” (12.8 cm)
Large 27.5 27.5/650b” 18” (50.6cm)* 22.7” (57.7cm) 32.5” (82.cm) 73 71 108.8 5” (12.8 cm)
Large 29 29” 18” (50cm)* 22.7” (57.7cm) 32.5” (82.6cm) 73 71 118.8 4.45” (11.3 cm)
Extra Large 26” 20” (56cm)* 24.4” (62cm) 32.5” (82.6cm) 72.5 71.5 108.8 5.91” (15 cm)
Extra Large 27.5 27.5/650b” 20” (54.6cm)* 24.4” (62cm) 33.5” (85cm) 72.5 71.5 112 5.91” (15 cm)
Extra Large 29 29” 20” (54cm)* 24.4” (62cm) 33.5” (85cm) 72.5 71.5 115 5” (12.8 cm)