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

Workshop tales, trials and disasters.
Maintenance tips, techniques and myths.
Technical discussion, description and outright lies

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 ?
2012 Merida Scultura Evo 905
User avatar
bollo
 
Posts: 489
Joined: Tue Feb 07, 2012 4:35 pm
Location: St Clair

by BNA » Mon Jun 24, 2013 6:19 pm

BNA
 

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
2012 Merida Scultura Evo 905
User avatar
bollo
 
Posts: 489
Joined: Tue Feb 07, 2012 4:35 pm
Location: St Clair

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.
Duck!
Expert
 
Posts: 1386
Joined: Tue May 21, 2013 8:21 pm
Location: On The Tools

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 ?
2012 Merida Scultura Evo 905
User avatar
bollo
 
Posts: 489
Joined: Tue Feb 07, 2012 4:35 pm
Location: St Clair

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
User avatar
biker jk
 
Posts: 2184
Joined: Tue Nov 17, 2009 5:18 pm
Location: Sydney

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
2012 Merida Scultura Evo 905
User avatar
bollo
 
Posts: 489
Joined: Tue Feb 07, 2012 4:35 pm
Location: St Clair

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.
Duck!
Expert
 
Posts: 1386
Joined: Tue May 21, 2013 8:21 pm
Location: On The Tools

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
2012 Merida Scultura Evo 905
User avatar
bollo
 
Posts: 489
Joined: Tue Feb 07, 2012 4:35 pm
Location: St Clair

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.
Duck!
Expert
 
Posts: 1386
Joined: Tue May 21, 2013 8:21 pm
Location: On The Tools

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
2012 Merida Scultura Evo 905
User avatar
bollo
 
Posts: 489
Joined: Tue Feb 07, 2012 4:35 pm
Location: St Clair

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.
Duck!
Expert
 
Posts: 1386
Joined: Tue May 21, 2013 8:21 pm
Location: On The Tools

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?
...whatever the road rules, self-preservation is the absolute priority for a cyclist when mixing it with motorised traffic.
London Boy 29/12/2011
User avatar
Mulger bill
Super Mod
Super Mod
 
Posts: 25275
Joined: Sun Sep 24, 2006 2:41 pm
Location: Sunbury Vic

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
2012 Merida Scultura Evo 905
User avatar
bollo
 
Posts: 489
Joined: Tue Feb 07, 2012 4:35 pm
Location: St Clair

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
2012 Merida Scultura Evo 905
User avatar
bollo
 
Posts: 489
Joined: Tue Feb 07, 2012 4:35 pm
Location: St Clair


Return to The Shed

Who is online

Users browsing this forum: No registered users



Support BNA
Click for online shops
Torpedo 7 Torpedo7 AU
Ground Effect Ground Effect NZ
Chain Reaction Cycles CRC UK
Wiggle Wiggle UK
Cycling Express Cycling Express
Ebay Ebay AU
ProBikeKit ProBikeKit UK
Evans Cycles Evans Cycles UK
JensonUSA Jenson USA
JensonUSA Competitive Cyclist