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Seriously Eco Logical

Bamboo Bike Frame Sizing

Pro / Cross / Triathlon / MTB and Custom Frames


Pro Road: 46 to 66cm stock frames see table

Cross Frame: less steep seat and head tube angles see table

Triathlon / TT: 650c wheels (700c on option), steeper seat tube, longer top tube, shorter stem see table

Mountain Bike: Disc ready frames for 26" and 29" mtb wheels see table

Custom: frames built to order from 30cm to 70cm. Around 1 in 8 people need a full custom frame, most people can fit a stock frame in comfort. ask

Pro Frame Geometries

Size* top tube length TT seat tube angle ST set back SB chainstay length stand over height b.b. drop head tube angle HT head tube length HT wheel base
46** 50 75 11.9 39 71.5 4 72 9.1 93.4
48 51.5 74.5 12.7 41.5 74.0 7 72 9.1 97.0
50 52.5 74.5 13.4 41.5 76.2 7 72.5 10.0 97.1
52 53 74 14.3 41.5 77.4 7 73 11.3 97.2
54 54.8 73.5 15.3 41.5 79 7 73 12.8 98.0
56 56 73 16.4 41.5 81.3 7 73.5 15.0 98.8
58 57 73 17.0 41.5 82.3 7 74 16.0 99.4
60 58.3 72.5 18.0 41.5 84.4 7 74 18.0 100.0
62 60 72.25 19.0 41.5 85.8 7 74 20.0 101.0
64 61 72 19.8 41.5 87.3 7 74 22.0 102.0
66 63.3 71.5 20.8 41.5 88.0 7 74 24.0 104.3
*Frame size is measured from center of bottom bracket to bottom of binder. Measure standover height (ground to top of top tube) and add 1 to 2cm to be sure of proper fit.
**46 cm frames use 650 c wheels

Cross Frame Geometries

Size* top tube length TT seat tube angle ST set back SB stand over height b.b. drop head tube angle HT head tube length HT max head tube extension max seat tube extension wheel base
48 52 72.5 14.4 76.0 5.5 70 9.1 3.5 1.5 98.0
50 53 72.5 15 78.2 5.5 70.5 10.0 3 3 98.1
52 53.5 72 16.1 79.4 5.5 71 11.3 2.5 3 98.2
54 55.3 71.5 17.1 81.0 5.5 71 12.8 3 2.5 99.0
56 56.5 71 18.2 83.3 5.5 71.5 15.0 3 3 99.8
58 57.5 71 18.9 84.3 5.5 72 16.0 2 2 100.5
60 58.8 70.5 20 86.2 5.5 72 18.0 3 2 101.1
62 60.5 70.25 21 88.0 5.5 72 20.0 3 2 102.1
64 61.5 70 21.9 89.8 5.5 72 22.0 2 1 103.1
*Frame size is measured from center of bottom bracket to bottom of binder. Measure standover height (ground to top of top tube) and add 1 to 2cm to be sure of proper fit.

Triathlon* / Time Trial* Frame Geometries

Size top tube length TT seat tube angle ST set back SB chainstay length stand over height b.b. drop head tube angle HT head tube length HT wheel base
46 49 77 10.3 39 71.0 4.0 72.5 9.1 93.4
48 50 77 10.8 39 71.5 4.0 72.5 9.1 94.4
50 51.5 77 11.2 39 72.1 4.5 72.5 10.0 96.0
52 53.5 77 11.6 39 73.8 4.5 73 11.3 97.8
54 55.5 76.5 12.5 39 74.8 4.5 73 12.8 99.6
56 57 76.5 13.0 39 [40.5] 77.4 [78.4] 4.5 [7.0] 73 [72.5] 15.0 [12.8] 101 [103.6]
58 58 76.5 13.6 39 [40.5] 78.9 [79.6] 4.5 [7.0] 73 [72.5] 16.0 [13.3] 102 [104.6]
60 60 76 14.5 39 [40.5] 79.5 [82.6] 4.5 [6.2] 73 [72.5] 18.0 [16.5] 104 [106.7]
*NOTE Standard with 650c wheel size (dimensions in brackets [] are for 700c wheel size option)

Mountain Bike Frame Geometries

Size wheel size nominal size effective top tube length TT stand over height seat tube angle ST head tube angle HT head tube length HT
Extra Small 26” 13” (33cm) 20” (50.7cm) 28” (71.1cm) 74.0 70.0 3” (7.6cm)
Small 26” 14” (36cm) 21.25” (54cm) 28.5” (72.4cm) 73.5 71.0 3.5” (8.9cm)
Medium 26” 16” (41cm) 22” (56cm) 30.5” (77.5cm) 73.0 71.0 3.5” (8.9cm)
Medium 29 29” 16” (41cm) 22” (56cm) 31.5” (80cm) 73.0 71.0 3.5” (8.9cm)
Large 26” 18” (46cm) 22.8” (58cm) 31” (78.7cm) 73.0 71.0 5” (12.8cm)
Large 29 29” 18” (46cm) 22.8” (58cm) 32.5” (80cm) 73.0 71.0 4” (10.1 cm)
Extra Large 26” 20” (51cm) 24.4” (62cm) 32.5” (80cm) 72.5 71.5 6” (15.2cm)
Extra Large 29 29” 20” (51cm) 24.4” (62cm) 33.5” (85cm) 72.5 71.5 5” (12.7cm)
*All frames accommodate disc brakes (no cantilever/V brake bosses)

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