Brettoll Posted April 7, 2021 Report Share Posted April 7, 2021 (edited) Hello! I am intending to put a set of Truvativ Descendant cranks w/ integrated 22th Extension ring - bash on my Mark 1 King of Dunce, it has a 68 BB.. however no matter what spacer set up I go for, it seems super close! Does anyone have experience in what spacers work? As I have tried the FSA site and they seem to think 7.5 on the drive - however, they don't seem to exist? Cheers! Brett Edited April 7, 2021 by Brettoll Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted April 7, 2021 Report Share Posted April 7, 2021 32 minutes ago, Brettoll said: 7.5 That would be three 2.5s. And it sounds like rather a lot, running a bit close on thread contact (BB vs frame) IMO. Better to have the cranks close than rip the BB out of the frame. With the straight chainstays on that frame, and a crankset it wasn't ever designed around, it's always gonna be close... As long as it doesn't hit under load, happy days. 1 Quote Link to comment Share on other sites More sharing options...
Mark W Posted April 7, 2021 Report Share Posted April 7, 2021 You'd need a 2.5mm spacer each side. The only 7.5mm spacer they refer to in the manual is the 'Wide' version of the spacer that goes between your chainring and BB, not the BB spacers themselves. The standard spacer (which you'll need) will be 4.5mm. The one supplied with the Inspired integrated bash looks like this - I assume that Extention would do a similar one with theirs: As before though, in terms of the cups it's a 2.5mm each side of the frame on the BB itself. It will be close just because of the stays on that frame. 1 Quote Link to comment Share on other sites More sharing options...
Brettoll Posted April 7, 2021 Author Report Share Posted April 7, 2021 (edited) Thanks Mark, So to put it into language my brain will get today. 2.5 inside the BOTH cups to BB shell 4.5 between cup outer and crank drive side 0 between cup outer and crank non drive side Unfortunately, the Extension integrated doesn't have a spacer like that, managed to get a spacer set that should have 4.5 in it. Will have a double-check. I had to busk it as Tarty had no Inspired Integrated nor the spacer. Cheers! Brett Edited April 7, 2021 by Brettoll Quote Link to comment Share on other sites More sharing options...
Mark W Posted April 7, 2021 Report Share Posted April 7, 2021 Haha, no judgement, I know what it has been/is like getting parts at the moment! The pre-DUB setups didn't need that spacer, but the DUB setups do, conveniently. That list you made is spot on though The only thing to note is that as before, it probably won't get you any extra clearance. It's just a function of the stays on the Ozonys being dead straight. Most modern frames have more of an S-shaped stay to give that extra clearance. If you really need to you can buzz a little off the backs of the crank arms with a grinder. I know plenty of people on Arcades who did that with the original Descendants which were a little flexier and had a little less offset. 1 Quote Link to comment Share on other sites More sharing options...
Brettoll Posted April 7, 2021 Author Report Share Posted April 7, 2021 19 minutes ago, Mark W said: Haha, no judgement, I know what it has been/is like getting parts at the moment! The pre-DUB setups didn't need that spacer, but the DUB setups do, conveniently. That list you made is spot on though The only thing to note is that as before, it probably won't get you any extra clearance. It's just a function of the stays on the Ozonys being dead straight. Most modern frames have more of an S-shaped stay to give that extra clearance. If you really need to you can buzz a little off the backs of the crank arms with a grinder. I know plenty of people on Arcades who did that with the original Descendants which were a little flexier and had a little less offset. Top tippage! Thank you. Yeah it is a weird time to be building a bike up. Quote Link to comment Share on other sites More sharing options...
Al_Fel Posted April 7, 2021 Report Share Posted April 7, 2021 Maybe fail some side hops so you end up with "tactical" dents in the chain stays... 1 Quote Link to comment Share on other sites More sharing options...
Brettoll Posted April 7, 2021 Author Report Share Posted April 7, 2021 4 minutes ago, Al_Fel said: Maybe fail some side hops so you end up with "tactical" dents in the chain stays... Accurate bashing! Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted April 7, 2021 Report Share Posted April 7, 2021 Ha. A novel idea... But yeah, as Mark says, buy what you need from wherever you can at the mo, people riding bikes is the overall goal The crank grinding tip is a good one too, forgot about that. 1 Quote Link to comment Share on other sites More sharing options...
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