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yeah i actually ordered the bits from RJC yesterday, had a quick google though as you just suggested, dodged a bullet with active sport by the looks of it.
phew!
phew!
middleburn, is it my imagination or . . .
- Thread starter jonnyboy666
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RS7 with Uno ring and Alfine is exactly what I'm running on the Fortitude. Cog dished out. Should have just asked us (retrobike that is) man. 
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well i thought no one was running it as it was not only modern but relatively uncommon, also i wanted to keep the build quiet 
jonnyboy666":b3o56pys said:weird, i can't find the email i sent to RJC . . . hmm.
anyway, i may have found the answer here:-
specifically Andy R's post down the page
viewtopic.php?t=91813
some of you may know i am having a bike built (again) last piece of the puzzle is the cranks and BB.
i want middleburn and i am using an alfine rear end, but i have never used a singlespeed/ring/alfine set up before so i am unfamiliar with the issues of chainline of this type of set up. it seemed like every time i looked into it people had different recommendations, the internet made it worse frankly!
i wanted RS7 cranks (square taper) as i prefer the look as they don't have the weird looking tension part on them that the external set does, then i had questions of the best set up, uno ring or spider and ring, and which one gave the correct chainline and did i need to differ from the recommended 113mm BB axle length. no one seemed to offer an answer from middleburn or activesport (i'm sure i emailed RJC but having just checked my sent box i can't find it, thinking about it, i did it direct through their site so it won't be in my sent box, idiot!)
so i think i have found the answer, just need to order now!
appreciate the help though guys, i sort of thought not many would be using this set up though so wouldn't have known, should have known better
With my odd screw-on freewheel single speed setup I found that a 107mm bottom bracket was better on my Uno with a 68mm shell frame.
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to be fair to them (Active Sport) I bought a few bits of ebay everything has turned up prompt, well packaged and correct.
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FluffyChicken":2va5qq57 said:
On that note I have also ordered 2 cranksets from them, and to be fair, they both arrived.
In this day and age though, with the service you get from the big boys, to order a fairly expensive part, then hear nothing for two weeks until a badly packaged, but thankfully undamaged crankset drops through the letterbox is hardly confidence inspiring. :roll:
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well, i got an email back from middleburn a few hours after i ordered the cranks, i thanked them for the advice and said i had ordered from RJC and also hinted why out of the 2 options i had found. not long after that i received an email from active sport with a list of the parts middleburn had recommended so i sort of feel bad that they went to the effort of doing that.
fyi though middleburn recommend a different solution to the alfine set up.
option 1, andy r's solution, which seems to be most common i have found so must work as people are doing it:-
middleburn cranks with an uno ring on a 113mm BB axle which gives a 50mm chainline, flip the rear sprocket which gives a chainline of 48mm, this works, if you want to be more exact you can use a slightly shorter BB, a 110 sounds like it would be better, i intend to use a royce so i'm sure cliff will help with that. also i think this set up looks neater.
option 2, middleburn recommendation:-
middleburn cranks, running their specific rohloff spider and a single ring, on a 113mm BB, this is designed specifically for a 42mm chainline which is what the alfine set up runs as standard.
that said, the uno set up just cost me £128, the rohloff and ring set up is upwards of £200 mainly because the parts are bought individually as opposed to a set like the uno is. i would have paid £200 if that's what was needed but it seems by comparison to be an expensive way of doing the same thing, with more parts involved. bearing in mind though that middleburn recommend this set up as the correct way to do it i hope that once i get mine built up it will work ok.
fyi though middleburn recommend a different solution to the alfine set up.
option 1, andy r's solution, which seems to be most common i have found so must work as people are doing it:-
middleburn cranks with an uno ring on a 113mm BB axle which gives a 50mm chainline, flip the rear sprocket which gives a chainline of 48mm, this works, if you want to be more exact you can use a slightly shorter BB, a 110 sounds like it would be better, i intend to use a royce so i'm sure cliff will help with that. also i think this set up looks neater.
option 2, middleburn recommendation:-
middleburn cranks, running their specific rohloff spider and a single ring, on a 113mm BB, this is designed specifically for a 42mm chainline which is what the alfine set up runs as standard.
that said, the uno set up just cost me £128, the rohloff and ring set up is upwards of £200 mainly because the parts are bought individually as opposed to a set like the uno is. i would have paid £200 if that's what was needed but it seems by comparison to be an expensive way of doing the same thing, with more parts involved. bearing in mind though that middleburn recommend this set up as the correct way to do it i hope that once i get mine built up it will work ok.
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So did Middleburn suggest where to purchase?
Option 1 does work.
Tbh, I never measured the chainline but it looks bang on. I guess 2mm is close enough to bang on to mke no difference. pretty sure it's a 113mm BB I went with.
Option 1 does work.
Tbh, I never measured the chainline but it looks bang on. I guess 2mm is close enough to bang on to mke no difference. pretty sure it's a 113mm BB I went with.
