will this new chainwheel fit or will i need to change ?

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will this new chainwheel fit or will i need to change ?

Postby bollo » Mon Jun 24, 2013 6:01 pm

i have a 2012 Merida Scultura Evo 905 currently running FSA Energy 50-34 BB30 will the Shimano Ultegra 6750 Hollowtech II Compact chainwheel fit ? if not what do i need to change ?
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by BNA » Mon Jun 24, 2013 6:19 pm

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Re: will this new chainwheel fit or will i need to change ?

Postby bollo » Mon Jun 24, 2013 6:19 pm

ok did some searching & turns out i will need a Shamano bottom bracket , i got one with my bike when i bought it (new) from the shop he mentioned if i ever changed the cranks to non BB30 i would need so i will have to dig it out
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Re: will this new chainwheel fit or will i need to change ?

Postby Duck! » Mon Jun 24, 2013 7:12 pm

Shimano bottom brackets are not compatible with BB30 frames. You'll have to hunt around for an adaptor set to convert BB30 to BB86 or BB90.

EDIT: My mistake, that should be BB92, not BB90 (that's MTB press-fit).
Last edited by Duck! on Mon Jun 24, 2013 7:41 pm, edited 1 time in total.
I had a thought, but it got run over as it crossed my mind.
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Re: will this new chainwheel fit or will i need to change ?

Postby bollo » Mon Jun 24, 2013 7:14 pm

hmm i got a bracket with the bike that has 86 on it is that what you mean ?
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Re: will this new chainwheel fit or will i need to change ?

Postby biker jk » Mon Jun 24, 2013 7:21 pm

Duck! wrote:Shimano bottom brackets are not compatible with BB30 frames. You'll have to hunt around for an adaptor set to convert BB30 to BB86 or BB90.


Doesn't he need a BB30 to Hollowtech II adapter such as those in the link below?

http://wheelsmfg.com/products/bottom-brackets-front-drivetrain/bb-adapters.html
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Re: will this new chainwheel fit or will i need to change ?

Postby bollo » Mon Jun 24, 2013 7:21 pm

this is what i got with the bike

Image
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Re: will this new chainwheel fit or will i need to change ?

Postby Duck! » Mon Jun 24, 2013 7:40 pm

Er... that says 68, not 86 (68 being the width of a BB30 or conventional screw-in bottom bracket) Got another pic of that thing, from a different angle? I'm not too sure how that would lock in securely enough to fit a screw-in BB. :?

biker jk wrote:
Duck! wrote:Shimano bottom brackets are not compatible with BB30 frames. You'll have to hunt around for an adaptor set to convert BB30 to BB86 or BB90.


Doesn't he need a BB30 to Hollowtech II adapter such as those in the link below?

http://wheelsmfg.com/products/bottom-brackets-front-drivetrain/bb-adapters.html

That's precisely what I was thinking of.

Incidentally, BB86 has a 86mm wide shell, into which press-fit bearing cartridges are fitted. BB92 (my bad, BB90 is different again.... :? ), like BB30 has the bearings pressed directly into the frame without housings. In both cases the resulting BB width is the same as a screw-in external cartridge BB.
I had a thought, but it got run over as it crossed my mind.
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Re: will this new chainwheel fit or will i need to change ?

Postby bollo » Mon Jun 24, 2013 8:10 pm

here are some other angles

Image

Image

hope this helps id it
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Re: will this new chainwheel fit or will i need to change ?

Postby Duck! » Mon Jun 24, 2013 8:23 pm

I haven't seen exactly that thing before, but I have seen complete BB cartridges on a similar principle (for fitting into frames where the thread has been stripped).

I'm guessing it's in two parts that thread together; in which case, you'd separate them, insert them into either side of the frame (there's a specific way for it to go - one side will have a reverse thread for the BB, this goes in the right [drive] side of the frame) & screw them together. Then fit the screw-in Shimano BB.
I had a thought, but it got run over as it crossed my mind.
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Re: will this new chainwheel fit or will i need to change ?

Postby bollo » Mon Jun 24, 2013 8:26 pm

it's a 1 piece with a tapered washer on 1 end & the 2 center washers
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Re: will this new chainwheel fit or will i need to change ?

Postby Duck! » Mon Jun 24, 2013 8:32 pm

Righto. I suggest paying a visit to your friendly Merida dealer for more info, 'cos it's got me stumped as to how it could be fitted securely enough to screw a BB into it.
I had a thought, but it got run over as it crossed my mind.
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Re: will this new chainwheel fit or will i need to change ?

Postby Mulger bill » Mon Jun 24, 2013 8:34 pm

Is that tapered section on the left with the big chunk out of it removeable?
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Re: will this new chainwheel fit or will i need to change ?

Postby bollo » Mon Jun 24, 2013 8:44 pm

just checked defiantly 1 piece i'll go see the guys at Blackmans tomorrow , cheers for all the helps guys :D
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Re: will this new chainwheel fit or will i need to change ?

Postby bollo » Mon Jun 24, 2013 8:47 pm

ok with more searching i found this old thread viewtopic.php?f=9&t=35177 so seams this is not an old issue & is easily sorted
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