April 25, 20233 yr Unusual rear cluster set up there Sturmey, cant't say I have seen them in reverse before. What was the reasoning behind it, chainline and gear selection ?
April 25, 20233 yr Author Unusual rear cluster set up there Sturmey, cant't say I have seen them in reverse before. What was the reasoning behind it, chainline and gear selection ? It looks like [mention=18796]Sturmey[/mention] has created a 2 X 5 offset to the right. 10 out of 10 for ingenuity on the custom cluster, and the long reach front derailleur. I am curious if an un-dished 1 x 36t or similar would completely destroy my chainline. I guess there is one way to find out. My BB shell is strangely offset to the left anyway (original front derailleur bracket was part of BB) so my chainline will probably be a bit better.
April 25, 20233 yr Unusual rear cluster set up there Sturmey, cant't say I have seen them in reverse before. What was the reasoning behind it, chainline and gear selection ? When you rearrange the gear cluster, the unused gears can to be put back as spacers as required. i.e. in my case only 5 out of the seven gears are used, the other gears are mere spacers. The stop screws are adjusted accordingly. Common practise with mid-drives to fix chainline and many think close ratio gearing is not necessary with power. e.g. quick search video below.
April 25, 20233 yr It looks like [mention=18796]Sturmey[/mention] has created a 2 X 5 offset to the right. 10 out of 10 for ingenuity on the custom cluster, and the long reach front derailleur. I am curious if an un-dished 1 x 36t or similar would completely destroy my chainline. I guess there is one way to find out. My BB shell is strangely offset to the left anyway (original front derailleur bracket was part of BB) so my chainline will probably be a bit better. To get a few extra mm reach on your front deraillur, use a longer bolt on the bracket and pack something between it and right side frame e.g. cut about 90 degrees of thick plastic pipe and put between deraillur and frame. I think the 34t steel is the smallest front chainring that easily works but you loose 5mm on the chainline as there is not enough room for the offset. There are other and more expensive solutions that improve on this such as special lekkie chainring etc but i have no experience of these.
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