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Brettoll

DUB Spacing Help!

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Posted (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?

276fd114-e8e4-4d31-b400-e22995d65cc5.thumb.jpeg.f2268b57aba0b976b0192612456a32cd.jpeg

Cheers!

Brett

Edited by Brettoll

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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.

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You'd need a 2.5mm spacer each side.

sramchat.jpg

 

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:

sraminspiredspacer.jpg

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.

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Posted (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 by Brettoll

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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 (Y) 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.

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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 (Y) 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.

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Maybe fail some side hops so you end up with "tactical" dents in the chain stays...

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4 minutes ago, Al_Fel said:

Maybe fail some side hops so you end up with "tactical" dents in the chain stays...

Accurate bashing!

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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 :D

The crank grinding tip is a good one too, forgot about that.

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