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Spoke Calculation Info

These are the necessary Surly hub dimensions you'll need to help determine proper spoke lengths. Since we cannot do the calculations for you, we are not responsible for incorrect calculations. When in doubt, consult a professional bike mechanic. Please note, our old “1x1” has been discontinued. It's a low flange hub with “1x1” markings. Our “New” hub (it's actually called the “New” hub) is the latest and greatest, has high flanges and “SURLY” markings. All hubs are 32 or 36 hole. If your spoke calculator asks for spoke hole diameter, enter 2.4mm. If you have no idea how these dimensions will improve your life, go to another page on this site until you find something meaningful.

1x1 (old)

FRONT (100mm spacing)
flange diameter (L or R): 43mm
(C-T-F) center of hub flange (L or R): 33mm

REAR (135mm spacing)
flange diameter (L or R): 43mm
C-T-F (L or R): 39mm

Bearing Sizes:

Old Style Hubs
Front: R6 bearing, 9.5mm i.d., 22.2mm o.d., 7.0mm thick
Rear: 6200 bearing, 10.0mm i.d., 30.0mm o.d., 9.0mm thick
These are non-adjustable bearings

“New”

FRONT (100mm spacing)
flange diameter (L or R): 54mm
C-T-F (L or R): 32.2mm

FRONT DISC (100mm spacing)
flange diameter (L or R): 58mm
C-T-F (left/disc side): 22.5mm
C-T-F (right/drive side):32mm



REAR TRACK (120mm spacing)
Dual fixed gear threading
flange diameter (L or R): 54mm
C-T-F (L or R): 30mm

REAR TRACK (120mm spacing)
Fixed threading/freewheel threading
flange diameter (L or R): 54mm
C-T-F (fixed gear side): 31mm
C-T-F (freewheel side): 30mm

REAR ROAD BIKE (130mm spacing)
Fixed threading/freewheel threading
flange diameter (L or R): 54mm
C-T-F (fixed gear side): 33mm
C-T-F (freewheel side): 31.5mm

REAR MOUNTAIN BIKE (135mm spacing)
Dual freewheel threads
flange diameter (L or R): 54mm
C-T-F (L or R): 38.5mm

REAR MOUNTAIN BIKE (135mm spacing)
Fixed threading/freewheel threading
flange diameter (L or R): 54mm
C-T-F (fixed gear side): 37.5mm
C-T-F (freewheel side): 38.5mm

REAR DISC MOUNTAIN BIKE (135mm spacing)
Freewheel threading
flange diameter (L or R): 58mm
C-T-F (left/disc side): 34mm
C-T-F (right/drive side): 38.5mm

Bearing Sizes:

All New model hubs (front and rear) use the same bearings
7901 bearing (full compliment, adjustable cartridge), 12.0mm i.d., 24.0mm o.d., 6.0mm thick
These bearings are adjustable cartridge type. They should be adjusted prior to use to ensure longest life, and occasionally throughout the life of the hub.

Surly cannot guarantee the accuracy of the measurements. It is ultimately the responsibility of the mechanic to make sure that the spoke lengths are correct.

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