EBB details on Seven Cycles Bottom Bracket Shell?

[jmlag]

Hi,

Would anyone know the details of the EBB that comes on a Seven Cycles SS MTB?

1.)Is it considered a standard EBB?
2.)Is it a standard EBB shell?
3.)Is it a pinch bolt or wedge type?
4.)What is the size? Width?
5.)Has anyone used any Philwood products? (Gary this one is directed to you; replacement EBB's in particular)

Any input would be great!

Thanks in advance.

[32by18]

Hi JM

Maybe you can use this as a guide (taken from the SS FAQ at mtbr.com), I think your Seven uses a pinch bolt...

"There are basically three (3) differents Eccentric Bottom Bracket (EBB) designs:

1. Wedge bolt (e.g. - Bushnell & Cannondale)
2. Pinch bolt
3. Set screw

1. Wedge bolt designs use a seamless EBB shell and an expanding wedge bolt design. The concept is similar to that of a quill stem, in that tightening a bolt expands the eccentric within the EBB shell. While the design works very well, some types of wedge bolt eccentrics can binds in the shell, requiring a rubber or wooden mallet to loosen the eccentric once the bolt(s) have been loosened. NOTE: Bushnell EBBs are designed with a self-unlocking mechanism.

2. Pinch bolt designs use a slotted EBB shell with external bolts that pinch the EBB shell around the eccentric. This simple design works very well. The open EBB shell is exposed to more contamination, though, and may require more frequent greasing than the other two designs.

3. Set screw designs use a seamless EBB shell with external set screws that thread directly into the EBB shell and rest tightly against the eccentric itself. The only minor drawback to this design is that the set screws may "divot" the eccentric somewhat. This may eventually lead to "sweet spots" that cause the eccentric to locate to certain positions within the EBB shell.

All three designs are well-proven, and should provide a relatively maintenance-free means to tension your single speed's chain. There may, however, be differences in the amount of "throw" provided by the different eccentric designs, which could potentially limit chain tensioning effectiveness when using certain gear combinations. Consult a reputable framebuilder to confirm compatibility between that framebuilder's preferred EBB design and your intended gearing. "

You can use "normal" BBs with an EBB (of course, external types may get in the way of some types of EBB systems)

Perhaps you can send an email to Seven, and include your bike's serial number?

[jmlag]

32by18 said:

Hi JM

Maybe you can use this as a guide (taken from the SS FAQ at mtbr.com), I think your Seven uses a pinch bolt...

"There are basically three (3) differents Eccentric Bottom Bracket (EBB) designs:

1. Wedge bolt (e.g. - Bushnell & Cannondale)
2. Pinch bolt
3. Set screw

1. Wedge bolt designs use a seamless EBB shell and an expanding wedge bolt design. The concept is similar to that of a quill stem, in that tightening a bolt expands the eccentric within the EBB shell. While the design works very well, some types of wedge bolt eccentrics can binds in the shell, requiring a rubber or wooden mallet to loosen the eccentric once the bolt(s) have been loosened. NOTE: Bushnell EBBs are designed with a self-unlocking mechanism.

2. Pinch bolt designs use a slotted EBB shell with external bolts that pinch the EBB shell around the eccentric. This simple design works very well. The open EBB shell is exposed to more contamination, though, and may require more frequent greasing than the other two designs.

3. Set screw designs use a seamless EBB shell with external set screws that thread directly into the EBB shell and rest tightly against the eccentric itself. The only minor drawback to this design is that the set screws may "divot" the eccentric somewhat. This may eventually lead to "sweet spots" that cause the eccentric to locate to certain positions within the EBB shell.

All three designs are well-proven, and should provide a relatively maintenance-free means to tension your single speed's chain. There may, however, be differences in the amount of "throw" provided by the different eccentric designs, which could potentially limit chain tensioning effectiveness when using certain gear combinations. Consult a reputable framebuilder to confirm compatibility between that framebuilder's preferred EBB design and your intended gearing. "

You can use "normal" BBs with an EBB (of course, external types may get in the way of some types of EBB systems)

Perhaps you can send an email to Seven, and include your bike's serial number?

How did I know you would be the first to answer? Ha ha. Thanks Agu. Yup I did write them and I gave the serial number. I'm just getting impatient waiting for the information so I figured I'd post the question on this board as well.

I feel I've been having to tighten my EBB too much to get it to hold steady so I wanted to check out my options on replacement EBBs. I've been hearing good things about Philwood EBBs.

By the way, I've tried external BB and spindle octa link on the EBB I have now. They both work pretty nicely. The tightening screw of the EBB is positioned nicely so the External BB doesn't get in the way. I was using an External BB setup during last year's race in Maarat. Race Face Deus XC crank/bb. I cracked the RF chainring though and I had to use King's 32t.....

[32by18]

jmlag said:

I feel I've been having to tighten my EBB too much to get it to hold steady...I cracked the RF chainring though and I had to use King's 32t.....

Hehe I don't think the frame can handle the torque/power you're generating my friend!

Good luck with the EBB search. Seven should get back to you soon (as soon as they get back from riding, that is!)

I'm switching to an external BB myself. Now my ride has 'up-to-date' and 'modern' parts hehe

[king]

i think the Bushnell/wedge type ones are better since the set screw ones have a tenbdency to slip & damage the ebb unless they're really tight. you should check out edmund's juan solo. it should have a Bushnell EBB

www.salsacycles.com/pdf/SalsaJuanSoloInstr.pdf

[flipnidaho]

Hey JM,
Sorry dude, I'm not too terribly familiar with EBB's. However, if you are having problems with the pinch bolts backing out, some Loctite 242 (blue) may help, do not grease the shell when installing the EBB (use anti-seize or tri-prep instead), teflon tape inside the shell to add some grip and take up any gaps (tighten the tolerance),

I'm really a bad person to ask since all my SS are converted gearies...

Sorry I'm not much help...
Gary

[jmlag]

king said:

i think the Bushnell/wedge type ones are better since the set screw ones have a tenbdency to slip & damage the ebb unless they're really tight. you should check out edmund's juan solo. it should have a Bushnell EBB

www.salsacycles.com/pdf/SalsaJuanSoloInstr.pdf

Thanks King. After seeing the Salsa Bushnell EBB in the picture I think mine is an older version of the Bushnell. I think I'll just have to take mine apart and see for myself since they haven't replied to my email yet.