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Bottom Bracket Replacement

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Old 07-06-14 | 12:34 PM
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Bottom Bracket Replacement

Hi Guys,

I'm trying to get back in to cycling after many years out of the saddle. I have just bought myself a second hand bike and I'm trying to buy some better gear for it.
The plan is to get a new 10 speed rear cassette, derailleur, BB, chain, trigger shifters and pedals. The trouble is I have no idea what it compatible with what.

The first thing on the list is the bottom bracket. Its worn and has excessive play. I'm looking to replace it but have no idea what to replace it with.
Ideally I'd like to get this kit: https://www.bikeporn.co.uk/ecommerce/...groupset-p-465

Is there a way to find out what type of bottom bracket I need? I've taken a risk and ordered a tool that looks as though it might get the old one off.
Any help would be greatly appreciated
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Old 07-06-14 | 02:54 PM
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We need more information. The type of bottom bracket you need is highly dependent on the type of crank you have and the width and threading of the bottom bracket shell.
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Old 07-06-14 | 03:38 PM
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At the minimum we need bike brand to even begin.
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Old 07-06-14 | 05:07 PM
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Originally Posted by 1986raleigh
At the minimum we need bike brand to even begin.
I don't know what bike it is because someone has painted it. All I have is the serial number which is: SF40691219

I measured the width of the shell and it looks to be 6.7cm or 2.6"
It appears to have an internal notched ring at the bottom bracket, and a squared end where the crank arm attaches.
Sorry to be so vague, I only just got the bike and I am pretty clueless
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Old 07-06-14 | 05:14 PM
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Sounds like a 68mm square taper. Now we need to know which threading it has. English, French, Italian, etc. Can't check that until you get the existing one out.
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Old 07-06-14 | 05:29 PM
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Originally Posted by SquidPuppet
Sounds like a 68mm square taper. Now we need to know which threading it has. English, French, Italian, etc. Can't check that until you get the existing one out.
Drive side normal righty tightly lefty loosy, non drive side lefty tighty righty loosy
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Old 07-06-14 | 05:37 PM
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Pictures would be a HUGE help. Pics of the frame. The shifters. Close-ups of the crankset. Any markings on them, even the back sides of the crank arm. Any markings on the original bottom bracket.
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Old 07-06-14 | 07:34 PM
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Originally Posted by 1986raleigh
Drive side normal righty tightly lefty loosy, non drive side lefty tighty righty loosy
Where did you get your experience? PLUTO?
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Old 07-06-14 | 08:07 PM
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Originally Posted by Bill Kapaun
Where did you get your experience? PLUTO?
Mars, sorry long day bass akwards directions... mea culpa mea culpa.

I'm a southpaw, dyslexic ...
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Old 07-06-14 | 08:22 PM
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Before you do anything you need to know some basics. How many speeds is it now? What is the rear spacing? Repainted used bike. Is it 30 years old or 5. Makes a difference on "get a 10 speed cassette etc". Square taper BB leads me to believe you may spend much more than the bike is worth to do what you want and a new bike might actually be cheaper.
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Old 07-07-14 | 01:50 PM
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Thanks all for taking the time to reply. I only paid about $34 for the bike so wasn't expecting much.
I have taken some pictures: https://www.dropbox.com/sh/l7e72gvl0...qejOAxWrGkdr_a

I'd like to fit a Hollowtech II chain set thingy ideally
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Old 07-07-14 | 01:57 PM
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Originally Posted by Enoch Powell
Thanks all for taking the time to reply. I only paid about $34 for the bike so wasn't expecting much.
I have taken some pictures: https://www.dropbox.com/sh/l7e72gvl0...qejOAxWrGkdr_a

I'd like to fit a Hollowtech II chain set thingy ideally
Here's a weird crazy idea: why not just get what you have working well and ride it.
Can you feel the difference between nine speeds and ten?
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Old 07-07-14 | 02:16 PM
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Because the bike came without a derailleur and so I would need to get one in any case. The derailleur that I liked was a ten speed one, so I thought with the bottom bracket warn and in need of renewal, I may as well get a matching chain set.
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Old 07-07-14 | 02:53 PM
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Man they went nuts with a aerosol can for sure :-).

IMHO go to the LBS and buy £529.99 worth of bicycle :-). From my POV it is nuts to invest money into the tools required to work on an extinct BB system just to get $30 worth of bike into working order...



Bill

Last edited by Willbird; 07-07-14 at 02:58 PM.
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Old 07-07-14 | 04:15 PM
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Originally Posted by Enoch Powell
Because the bike came without a derailleur and so I would need to get one in any case. The derailleur that I liked was a ten speed one, so I thought with the bottom bracket warn and in need of renewal, I may as well get a matching chain set.
You can't use a 10 speed derailleur without the matching 10 speed shifters. The bike has a 9 speed cassette. Can't see in your pictures, but I will assume that there is a 9 speed shifter on the bar. Get a derailleur that will work with the shifter. Shimano 9 and 10 speed mountain bike shifters and derailleurs are not compatible with each other so if you change, you have to change everything, shifters, cassette, chain, and derailleurs. This could get very expensive
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Old 07-07-14 | 04:51 PM
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Originally Posted by alcjphil
Shimano 9 and 10 speed mountain bike shifters and derailleurs are not compatible with each other so if you change, you have to change everything, shifters, cassette, chain, and derailleurs. This could get very expensive
Shimano 9-speed shifters aren't compatible with the 10-speed Dyna-Sys derailleurs, but they are compatible with cheap and readily-available 7/8/9 speed mountain bike derailleurs. A sub-$20 Shimano Altus rear derailleur like this one should bolt right on and work with the current parts on this bike.

EXCEPT... This bike isn't just missing the rear derailleur. It's also missing the rear derailleur hanger, which is the part of the frame the derailleur threads into. Most newer better-quality bikes have a replaceable derailleur hanger so that if it snaps off, you can bolt on a new hanger. If your frame doesn't have a replaceable hanger, you might be better off looking for a different frame (or bike).

Take more pics of the rear dropout where the derailleur would be, but with the chain out of the way. Even better, with the wheel removed. We should be able to tell if the frame has (had) a replaceable hanger.

As for buying the Deore XT groupset linked in the original post, you might want to figure out what kind of bike this is first to figure out if the bike merits such an upgrade. If you put a £530 groupset on a £50 bike, it's kind of like spending a fortune to buy a Ferrari engine, only to put it in a Kia. Even with the better engine, it's still a Kia.

Last edited by SkyDog75; 07-07-14 at 05:14 PM.
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Old 07-07-14 | 05:02 PM
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Originally Posted by SkyDog75
. . . If your frame doesn't have a replaceable hanger, you might be better off looking for a different frame. . .
Or a claw mount der.
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Old 07-07-14 | 05:10 PM
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Originally Posted by Enoch Powell
Because the bike came without a derailleur and so I would need to get one in any case. The derailleur that I liked was a ten speed one, so I thought with the bottom bracket warn and in need of renewal, I may as well get a matching chain set.
The reason the rear derailleur is missing is because the hanger appears to be missing. There's no longer a place to mount the derailleur.

It may or may not be a sacrificial member. I cannot tell from the pictures. If it is a sacrificial member you will need to know the make, model and year to find its replacement. If it isn't, the frame's use as a derailleur bike is past history.
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Old 07-07-14 | 05:24 PM
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Originally Posted by AnkleWork
Or a claw mount der.
I don't know if I'd want to try adjusting 9- or 10-speed indexing on a claw-mounted derailleur. And reverting to friction shifting doesn't seem to mesh with the OP's wants.
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Old 07-11-14 | 09:56 AM
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Originally Posted by SBinNYC
The reason the rear derailleur is missing is because the hanger appears to be missing. There's no longer a place to mount the derailleur.

It may or may not be a sacrificial member. I cannot tell from the pictures. If it is a sacrificial member you will need to know the make, model and year to find its replacement. If it isn't, the frame's use as a derailleur bike is past history.
Bad news
I had assumed the derailleur bolted onto the two holes in the frame. I got the tools to remove the pedal arm and bb. The bb is being stubborn though. I guess if I can't figure out which hunger I need to get if doesn't matter in any case.
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Old 07-14-14 | 02:52 AM
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Hello, I have Fuji Team Race 2002 frame 2002 Fuji Team - BikePedia, I was wondering is there any chance to put octalink bottom bracket and Shimano Claris FC 2450, 170 mm on that frame instead Hollowtech 68 mm, Shimano BB 6700 B and Shimano FC 3550 50X34,170mm. And I have one more question what type of derailleur hanger do I need, I asked some people from Fuji they told me that I need DH 002, but I didn't find derailleur hanger with that label on it. I can send you a detailed pic of frame if you need.
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Old 07-14-14 | 10:08 AM
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From my POV it is nuts to invest money into the tools required to work on an extinct BB system
A similar thing happened to me.

I wanted to transfer the bottom bracket from my old mountain bike frame onto my new one. In order to do so, i'd need to buy a £16 oval spanner and a £16 3 tipped spanner (?, the one with three pointy bits inside a circle).

Alternatively, I could buy a £10 sealed bottom bracket and an £8 sealed bottom bracket tool instead. Much better, and much cheaper!
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