tina_tina

Hi, I’m building my first bike and I just want to make sure I’m doing every right. I’m installing a Dura Ace 7710 Bottom bracket into my frame and I see that on one side it doesn’t thread in all the way and I don’t want to force it because I don’t want things to get stripped.

Here is what I found out.
If I thread in the Right cup by itself, it goes in all the way.
If I thread in the Left cup by itself, it goes in all the way.
It’s only when I thread in the whole assembly that one of the cups doesn’t thread in all the way.
So basically what you see in the picture is, I have the Right side of the bottom bracket tightened all they way, and as for the Left side, it’s as far as it goes in.

Also I have not torque down the bottom bracket, it’s just put on hand tight with the park tool. I’m sure the left side will go in a little more when I torque it all down but it will not go in all the way. Is this normal? I know people with Concepts have used this bottom bracket, do you guys just leave it like this? Or do you tighten it down all the way and everything is fine? Like I said this is my first build and i just want to make sure I’m doing everything correct., I don’t plan on taking it to the bike shop so don’t suggest that to me.




Thanks

Cynikal 

It looks like you have the BB reversed. The side pictured is the drive side and should be on the right side of the bike. The drive side should should thread in all the way while the non-drive side will thread in enough to hole the cartridge tight in the BB shell.

trons

Cynikal 

Sorry, it appears that I was mistaken. The side with the 8 slots is the non-drive side.

tina_tina

ok so i have the bottom bracket installed correctly. Now can someone tell me why it wont thread in all the way? or is it not supposed to?

carleton

You will get better answers in the Mechanics Forum: https://www.bikeforums.net/bicycle-mechanics/

carleton

By the way, that's a pretty bullheaded approach. You have a nice, expensive frame and a nice, expensive crankset. It would be wise not to skimp on getting it installed correctly to 1) Not screw up your expensive parts and 2) Ensure that you are riding safely...but that's just me. Call me a "big shot elitist" for being willing to drop a whopping $20 to have it installed at a shop.

tina_tina

i talked to some of the guys at my bike shop, he said to just tight it down all the way. so i dont think ill be taking my bike over to that cats shop cause if thats the case, i can do that myself. i just thought id post here to see what some of you guys did about this issue. i think ill also post this in machanics thread and see if i get any more answers. If i dont, then ill give Shimano a call and see whats up, but this bike will never be worked on by someone else.

carleton

Well, from a guy that's had BB shell issues with a Pista Concept (me) I'd say take it to a mechanic. My black pista concept had a stripped BB shell that had to be sent back to Bianchi and replaced with a whole new frame and fork. But only an authorized Bianchi dealer can diagnose that and order the replacement.

But, I'm sure you already knew that.

And the BB I was using was the very same Octalink BB for the 7710 cranks. I later put them on the second bike.

Here's the failed build:


(don't mind the bars in the pic. I just threw all of the other parts on to get a feel for how the final build would look.)

carleton

Do you know how rare a new old stock matte black 2003-4 Pista Concept Frame is? There probably isn't another one on earth.

Can you imagine how pissed I was?

tina_tina

answer me this. does your bottom braket look like mine with the space? or does it thread in all the way? my threads are not stripped, i know that for a fact.

carleton

I don't have that bike anymore. But they should go in all the way.

One of 3 things is going on:
1) The BB shell of the frame isn't threaded deep enough (this is my guess, emphasis on "guess").
2) You have cross-threaded the BB and it won't sit flush.
3) You haven't tightened hard enough.

artesc

If you tighten in the wrong side first, you wont be able to get the the other side in. First put in the drive side, the one without the removable spindle until it is flush with the BB shell then screw in the other side (the removable spindle-cup) as far as it will go. If that doesn't work, then there is something horribly, horribly wrong with either the threading on your bb cup or the BB itself.

Palaber

Hi tina tina, if you have no clue about stuff like this it might not be the best idea to build your bike yourself. aluminium bootom brackets are extermly vunerabel. on the other hand, its really not that hard. screw the bb in from the drive side to about 30 Nm, then screw the non drive side cup on as far as it will go. not to hard (again about 30-45 Nm), youll strip the threads. and use lots of grease, you can never you too much grease on an alu frame. it also really important that all the threads are clean, which shouldnt be a problem as all the stuff is new. oh, to answer your initial question, its perfectly normal for the non drive side cup to stick out like this. have fun with your bike

tina_tina

thanks for the answer, that what exactly what i wanted to read. i know i did everything right, i may not have any bike building experience, but i built a couple of race cars from the ground up so this bike business should be no problem to me.
Thanks again guys

KSnizzap

Why don't you want to bring it to a shop? I gathered all my parts and had a shop throw it together for me. So much easier than heckling with it.

carleton

Hahaha, exactly what you wanted to read?

H*ll, I can tell you exactly what you want to hear: It's perfect. Don't worry about it.

That doesn't mean it's the truth.

On the car tip, I don't care if a guy has been working at a Porsche dealership for 10 years. If he doesn't know Mark IV VWs he's not going to touch my R32. Nothing beats experience with the job at hand. Part of experience is identifying defective parts. But, now I'm beating a dead horse.

artesc

Ummmm...ok?

When you started building race cars (ahem), did you just blindly start taking and putting parts on without any training whatsoever? I didn't think so. As simple as working on bikes may or may not be, you do need a least a little guidance. Don't be too proud to take it to a bike shop.

Live2Die

Wrenching a car and a bike are two very different things, but with that said, if you are going to refuse help of a shop read sheldon's site till you can't stand it anymore and keep asking questions here. It's not worth ruining that frame or any frame for that matter just for the experience. Good luck with your build!