Bottom brackets and chain devices

grommet · June 2007

Hi all,

I need a new bottom bracket, the one i have is pritty badly gone now and im set on buying the same one again as its gone through about 16 months of abuse and has only been noticably loose for around a month.

Its a Truvativ Giga Pipe SL ISIS and my bb shell appears to measure 68mm. However, I also want to fit a chain device but do not have the mountings on my frame so I need to buy a bb mounted one. There are a few problems though; im not too sure on how to fit one and there doesnt seem to be any room for the chain device to mount on the bb.

Any advice on how to sort this would be great
Many Thanks

ROCHA · June 2007

Buy a 73mm one. That leaves you with 2.5mm on each side. On the right you put the chain device or isgc mount adaptor for it, on the left a spacer or nothing(some truvativ bb's don't need a spacer, you just tighten it up and leave the gap)
http://www.chainreactioncycles.com/Mode ... elID=11453

WD-40? GT-85?? I'd rather use the old AK-47!

grommet · June 2007

ok many thanks

nicklouse · June 2007

get a 68mm Emount one. it is for an E mount front mech or chaindevice.

nick
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grommet · June 2007

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by nicklouse

get a 68mm Emount one. it is for an E mount front mech or chaindevice.

nick
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My Pictures.
Pinkbike Album.
<center>
"Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."

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<hr height="1" noshade id="quote"></blockquote id="quote">
its for a chain device. but will the 73mm one work any way?

Thanks

rubber side up · June 2007

if your frame has a 68mm shell, buy a 68mm bb.

<hr noshade size="1"><center><blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by EvilAlex

Something round here tastes bad. Could be plain old bad taste.
<hr height="1" noshade id="quote"></blockquote id="quote"></center>www.mtb-bitz.co.uk - Bitz for you & your mountain bike. pinkbike

grommet · June 2007

yeah but will this work?
ROCHA

Coimbra
Portugal
114 Posts
Posted - 13/06/2007 : 23:00:16

Buy a 73mm one. That leaves you with 2.5mm on each side. On the right you put the chain device or isgc mount adaptor for it, on the left a spacer or nothing(some truvativ bb's don't need a spacer, you just tighten it up and leave the gap)
http://www.chainreactioncycles.com/Mode ... elID=11453

ROCHA · June 2007

That will work, but if there's an e-mount version of the bb you want you can get it and you're done.

WD-40? GT-85?? I'd rather use the old AK-47!

grommet · June 2007

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by ROCHA

That will work, but if there's an e-mount version of the bb you want you can get it and you're done.

WD-40? GT-85?? I'd rather use the old AK-47!
<hr height="1" noshade id="quote"></blockquote id="quote">

ok but if i do as you suggested will it work as well?

thanks

ROCHA · June 2007

Yes it will. The guy at my lbs allways fits 73mm into 68mm frames when installing chain guides 'cause it gets the job done just aswell and e-type ones are harder to find.

WD-40? GT-85?? I'd rather use the old AK-47!

grommet · June 2007

ok many thanks

rubber side up · June 2007

*stays well clear of ROCHA's LBS*

<hr noshade size="1"><center><blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by EvilAlex

Something round here tastes bad. Could be plain old bad taste.
<hr height="1" noshade id="quote"></blockquote id="quote"></center>www.mtb-bitz.co.uk - Bitz for you & your mountain bike. pinkbike

grommet · June 2007

Are you sure this will work because at the age of 16 it takes absoultly ages to save up money if it messes up.

Thanks

ROCHA · June 2007

http://www.chainreactioncycles.com/Mode ... delID=4981

These can be used in either 68 or 73 bb frames. If you put them in a 68 frame you either use the spacer (supplied) or put the chain device hanger in its place. There's no reason why this can't be done in any 73mm bb. It's not like you need to be a rocket scientist to figure this out..

WD-40? GT-85?? I'd rather use the old AK-47!

grommet · June 2007

ok thanks for all the help!

ROCHA · June 2007

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by rubber side up

*stays well clear of ROCHA's LBS*

<hr noshade size="1"><center><blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by EvilAlex

Something round here tastes bad. Could be plain old bad taste.
<hr height="1" noshade id="quote"></blockquote id="quote"></center>www.mtb-bitz.co.uk - Bitz for you & your mountain bike. pinkbike
<hr height="1" noshade id="quote"></blockquote id="quote">
Lots of people use the truvativ bb's the type that's on the crc link and have frames without ISCG tabs, so fitting a chain device the way I've said allows you to keep the same bb. This way you save money. It would be far more profitable to my lbs to sell a new bb for no reason or even a frame with ISCG, but budget leads to this practical solution. There's nothing wrong with my lbs... apart from prices, ocasionally[:)]

WD-40? GT-85?? I'd rather use the old AK-47!

skyliner · June 2007

The Truvativ BBs come in 68, 68E, 73 shell type fit, in 108, 110, 113, or 118mm axle widths. So if you buy a BB with the correct axle width for your chainset, you'd only have to choose between the aforementioned, or the 73E model.

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Bottom brackets and chain devices

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