Rohloff permitted sprocket ratios revised
Posted: Mon Dec 24, 2012 2:24 am
Not sure if this has come up before but I know I've read previously here about concerns with final drive ratio.
For those amongst us (like me who only spotted it this evening) Rohloff has revised the permitted transmission factor to 2.1 down from 2.38 with the caveat that its targeted only for solo cyclists under 100kg.
The spiel:
News
SPEEDHUB 500/14 revised permitted transmission factor now 2.1!
11.12.2012
The permitted sprocket ratios for the SPEEDHUB 500/14 were set to ensure the hub would not be damaged due to a high input torque. These limits were set identical to the lower limits of derailleur systems of the day (2.35) but these obviously also contained a small buffer.
Current derailleur systems offer lower gear ratios now which are particularly favored by 29er cyclists for hard off-road climbs. Due to the increased interest in these bicycles the Rohloff AG has reviewed our permitted ratios and reduced the transmission factor further to just 2.1 for solo cyclists under 100kg. The 'buffer' that the SPEEDHUB previously had available is not longer present and this new factor must not be reduced further.
SPEEDHUB equipped bicycles may now achieve 1.36m per crank revolution in their lowest gear without risk of losing warranty cover.
Calculating the Transmission factor:
36 tooth front chainring with a 17 tooth rear sprocket = 36:17= factor 2.11 (updated Table can be found in the Owners Manual, page 20).
The Transmission factor of 2.5 still applies for Tandem use and cyclists weighing over 100kg!
http://www.rohloff.de/en/news/news_rss/ ... index.html" onclick="window.open(this.href);return false;
There, my work is done - dont say I didnt give you anything for xmas
For those amongst us (like me who only spotted it this evening) Rohloff has revised the permitted transmission factor to 2.1 down from 2.38 with the caveat that its targeted only for solo cyclists under 100kg.
The spiel:
News
SPEEDHUB 500/14 revised permitted transmission factor now 2.1!
11.12.2012
The permitted sprocket ratios for the SPEEDHUB 500/14 were set to ensure the hub would not be damaged due to a high input torque. These limits were set identical to the lower limits of derailleur systems of the day (2.35) but these obviously also contained a small buffer.
Current derailleur systems offer lower gear ratios now which are particularly favored by 29er cyclists for hard off-road climbs. Due to the increased interest in these bicycles the Rohloff AG has reviewed our permitted ratios and reduced the transmission factor further to just 2.1 for solo cyclists under 100kg. The 'buffer' that the SPEEDHUB previously had available is not longer present and this new factor must not be reduced further.
SPEEDHUB equipped bicycles may now achieve 1.36m per crank revolution in their lowest gear without risk of losing warranty cover.
Calculating the Transmission factor:
36 tooth front chainring with a 17 tooth rear sprocket = 36:17= factor 2.11 (updated Table can be found in the Owners Manual, page 20).
The Transmission factor of 2.5 still applies for Tandem use and cyclists weighing over 100kg!
http://www.rohloff.de/en/news/news_rss/ ... index.html" onclick="window.open(this.href);return false;
There, my work is done - dont say I didnt give you anything for xmas