The Rohloff SPEEDHUB 500/14 requires a chainline of 54mm and with splined sprocket of 57mm. On bikes with three-ring cranksets, the middle chainring sits on a chainline of 47.5mm (measured from the frame center). The largest chainring has a chainline of 54mm.
On most MTB and Trekking bike cranksets, the largest chainring and bottom bracket can normally be reused in conjunction with the Rohloff SPEEDHUB 500/14.
Current Rohloff SPEEDHUB 500/14 models are equipped with our new splined carrier sprocket system which creates a 57mm chainline as opposed to the old 15, 16 & 17 tooth threaded sprockets which used a 54mm chainline. The center chainring position of a triple crankset is 47.5mm which places the outermost chainring in this optimal position for this new, wider chainline.
When converting MTBs and Trekking bikes for SPEEDHUB use, it is usually possible to simply remove all but the outermost chainring, and continue running the current crankset and BB.
- Art.#8540 Carrier (13.5mm deep) = compatible with 13-14-15-16-17-18-19-21 tooth sprockets = 57mm chainline
- Art.#8540s Carrier slim (11.5mm deep) = compatible with 15-16-17-18-19-21 tooth sprockets = 55mm chainline
Use of the the Carbon Drive system with the standard lock-ring splined carrier (Art.#8540L) will create a belt-line of 55 mm (+/-1mm).
Chainline offset Info:
Use of a SPEEDHUB on a frame with the average chainstay length of 450mm results in:
- 1° chainline offset / approximately 8mm
- 0.5° chainline offset / approximately 4mm
This is technically is harmless and unproblematic for the function.
Generally the goal is to create a chainline with as little offset as possible.
To extend the lifespan of all sprockets, it is also generally advised to use as many teeth as possible to achieve the desired transmission ratio.
Use of modern 12 and 13 speed derailleur cassettes will create a chainline offset of approximately 5-6° which translates to approximately 40-45mm.
When disassembling the crankset for use with the Rohloff SPEEDHUB 500/14, the middle and smallest chainring will not need to be used, so they must be removed from the crankset.
The chainring threaded bushes will be too long, because they are no longer securing two chainrings. For this reason there are five chainring spacers included in the small parts bag (to be found in every package). These should be placed over the threaded bushes before reassembling the crankset, so that the single chainring can be properly and tightly secured. (chainrig bolts: 5mm allen key, lightly greased, tightening torque: 7Nm/61in.lbs.).