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Damn BB Problems



 
 
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  #1  
Old December 4th 19, 01:27 AM posted to rec.bicycles.tech
Tom Kunich[_5_]
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Posts: 1,231
Default Damn BB Problems

I have a Redline cross bike and it had an XT crank on it that had a 24-38 rings. The bottom bracket appears to be an XT also but the only thing on it was "mountain" on both sides and the markings are "BB-MT800".

I pulled off the cranks and tried to replace them with a Reynolds 24 mm shaft compact chainset I tripped across while I was looking in my parts bin(s)

When I inserted it, I discovered that the end cap of the Reynolds crank was missing. Also it appears that the crank is about a 1/4th inch too short for that bottom bracket.

Tearing the universe apart I still haven't found the endcap which is smaller thread than the XT crank.`

So I need to figure out what BB the Reynolds is supposed to use. The Reynolds site was no help. Plus I can't find out what the size and thread of the endcap is and they make enough 2nd manufacturer end caps that they probably make one that will fit for $5-6.

Anyone got any information on these things?
  #2  
Old December 4th 19, 05:30 AM posted to rec.bicycles.tech
JBeattie
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Posts: 5,870
Default Damn BB Problems

On Tuesday, December 3, 2019 at 4:27:50 PM UTC-8, Tom Kunich wrote:
I have a Redline cross bike and it had an XT crank on it that had a 24-38 rings. The bottom bracket appears to be an XT also but the only thing on it was "mountain" on both sides and the markings are "BB-MT800".

I pulled off the cranks and tried to replace them with a Reynolds 24 mm shaft compact chainset I tripped across while I was looking in my parts bin(s)

When I inserted it, I discovered that the end cap of the Reynolds crank was missing. Also it appears that the crank is about a 1/4th inch too short for that bottom bracket.

Tearing the universe apart I still haven't found the endcap which is smaller thread than the XT crank.`

So I need to figure out what BB the Reynolds is supposed to use. The Reynolds site was no help. Plus I can't find out what the size and thread of the endcap is and they make enough 2nd manufacturer end caps that they probably make one that will fit for $5-6.

Anyone got any information on these things?


Oh Gawd, so all that wasted time on BB386. It is a f****** threaded BB. I was right.

Go buy a 105 crank and put the Reynolds crank back in the parts box or on eBay. Done.

-- Jay Beattie.
  #3  
Old December 4th 19, 06:32 PM posted to rec.bicycles.tech
Tom Kunich[_5_]
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Posts: 1,231
Default Damn BB Problems

On Tuesday, December 3, 2019 at 8:30:26 PM UTC-8, jbeattie wrote:
On Tuesday, December 3, 2019 at 4:27:50 PM UTC-8, Tom Kunich wrote:
I have a Redline cross bike and it had an XT crank on it that had a 24-38 rings. The bottom bracket appears to be an XT also but the only thing on it was "mountain" on both sides and the markings are "BB-MT800".

I pulled off the cranks and tried to replace them with a Reynolds 24 mm shaft compact chainset I tripped across while I was looking in my parts bin(s)

When I inserted it, I discovered that the end cap of the Reynolds crank was missing. Also it appears that the crank is about a 1/4th inch too short for that bottom bracket.

Tearing the universe apart I still haven't found the endcap which is smaller thread than the XT crank.`

So I need to figure out what BB the Reynolds is supposed to use. The Reynolds site was no help. Plus I can't find out what the size and thread of the endcap is and they make enough 2nd manufacturer end caps that they probably make one that will fit for $5-6.

Anyone got any information on these things?


Oh Gawd, so all that wasted time on BB386. It is a f****** threaded BB. I was right.

Go buy a 105 crank and put the Reynolds crank back in the parts box or on eBay. Done.

-- Jay Beattie.


Are you saying that BB-MT800 or whatever it is is a BB386? I'm not convinced they are. There isn't a lot width diffeence.
  #4  
Old December 4th 19, 09:29 PM posted to rec.bicycles.tech
JBeattie
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Posts: 5,870
Default Damn BB Problems

On Wednesday, December 4, 2019 at 9:32:13 AM UTC-8, Tom Kunich wrote:
On Tuesday, December 3, 2019 at 8:30:26 PM UTC-8, jbeattie wrote:
On Tuesday, December 3, 2019 at 4:27:50 PM UTC-8, Tom Kunich wrote:
I have a Redline cross bike and it had an XT crank on it that had a 24-38 rings. The bottom bracket appears to be an XT also but the only thing on it was "mountain" on both sides and the markings are "BB-MT800".

I pulled off the cranks and tried to replace them with a Reynolds 24 mm shaft compact chainset I tripped across while I was looking in my parts bin(s)

When I inserted it, I discovered that the end cap of the Reynolds crank was missing. Also it appears that the crank is about a 1/4th inch too short for that bottom bracket.

Tearing the universe apart I still haven't found the endcap which is smaller thread than the XT crank.`

So I need to figure out what BB the Reynolds is supposed to use. The Reynolds site was no help. Plus I can't find out what the size and thread of the endcap is and they make enough 2nd manufacturer end caps that they probably make one that will fit for $5-6.

Anyone got any information on these things?


Oh Gawd, so all that wasted time on BB386. It is a f****** threaded BB.. I was right.

Go buy a 105 crank and put the Reynolds crank back in the parts box or on eBay. Done.

-- Jay Beattie.


Are you saying that BB-MT800 or whatever it is is a BB386? I'm not convinced they are. There isn't a lot width diffeence.


NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO. BB386 is a press-fit format not a threaded cup. You have a plain old regular (probably) 68mm ISO threaded BB shell. The same thing as half the road bikes on the planet. You took a Shimano out, put a Shimano back. This is a two minute process. Just confirm that it is a 68mm BB and not a 73mm, which would be really odd for a CX bike..

-- Jay Beattie.
  #5  
Old December 4th 19, 10:13 PM posted to rec.bicycles.tech
Tom Kunich[_5_]
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Posts: 1,231
Default Damn BB Problems

On Wednesday, December 4, 2019 at 12:29:34 PM UTC-8, jbeattie wrote:
On Wednesday, December 4, 2019 at 9:32:13 AM UTC-8, Tom Kunich wrote:
On Tuesday, December 3, 2019 at 8:30:26 PM UTC-8, jbeattie wrote:
On Tuesday, December 3, 2019 at 4:27:50 PM UTC-8, Tom Kunich wrote:
I have a Redline cross bike and it had an XT crank on it that had a 24-38 rings. The bottom bracket appears to be an XT also but the only thing on it was "mountain" on both sides and the markings are "BB-MT800".

I pulled off the cranks and tried to replace them with a Reynolds 24 mm shaft compact chainset I tripped across while I was looking in my parts bin(s)

When I inserted it, I discovered that the end cap of the Reynolds crank was missing. Also it appears that the crank is about a 1/4th inch too short for that bottom bracket.

Tearing the universe apart I still haven't found the endcap which is smaller thread than the XT crank.`

So I need to figure out what BB the Reynolds is supposed to use. The Reynolds site was no help. Plus I can't find out what the size and thread of the endcap is and they make enough 2nd manufacturer end caps that they probably make one that will fit for $5-6.

Anyone got any information on these things?

Oh Gawd, so all that wasted time on BB386. It is a f****** threaded BB. I was right.

Go buy a 105 crank and put the Reynolds crank back in the parts box or on eBay. Done.

-- Jay Beattie.


Are you saying that BB-MT800 or whatever it is is a BB386? I'm not convinced they are. There isn't a lot width diffeence.


NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO. BB386 is a press-fit format not a threaded cup. You have a plain old regular (probably) 68mm ISO threaded BB shell. The same thing as half the road bikes on the planet. You took a Shimano out, put a Shimano back. This is a two minute process. Just confirm that it is a 68mm BB and not a 73mm, which would be really odd for a CX bike.

-- Jay Beattie.


https://www.bing.com/images/search?v...vt=0&eim=1,2,6
  #6  
Old December 4th 19, 10:46 PM posted to rec.bicycles.tech
JBeattie
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Posts: 5,870
Default Damn BB Problems

On Wednesday, December 4, 2019 at 1:13:06 PM UTC-8, Tom Kunich wrote:
On Wednesday, December 4, 2019 at 12:29:34 PM UTC-8, jbeattie wrote:
On Wednesday, December 4, 2019 at 9:32:13 AM UTC-8, Tom Kunich wrote:
On Tuesday, December 3, 2019 at 8:30:26 PM UTC-8, jbeattie wrote:
On Tuesday, December 3, 2019 at 4:27:50 PM UTC-8, Tom Kunich wrote:
I have a Redline cross bike and it had an XT crank on it that had a 24-38 rings. The bottom bracket appears to be an XT also but the only thing on it was "mountain" on both sides and the markings are "BB-MT800".

I pulled off the cranks and tried to replace them with a Reynolds 24 mm shaft compact chainset I tripped across while I was looking in my parts bin(s)

When I inserted it, I discovered that the end cap of the Reynolds crank was missing. Also it appears that the crank is about a 1/4th inch too short for that bottom bracket.

Tearing the universe apart I still haven't found the endcap which is smaller thread than the XT crank.`

So I need to figure out what BB the Reynolds is supposed to use. The Reynolds site was no help. Plus I can't find out what the size and thread of the endcap is and they make enough 2nd manufacturer end caps that they probably make one that will fit for $5-6.

Anyone got any information on these things?

Oh Gawd, so all that wasted time on BB386. It is a f****** threaded BB. I was right.

Go buy a 105 crank and put the Reynolds crank back in the parts box or on eBay. Done.

-- Jay Beattie.

Are you saying that BB-MT800 or whatever it is is a BB386? I'm not convinced they are. There isn't a lot width diffeence.


NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO. BB386 is a press-fit format not a threaded cup. You have a plain old regular (probably) 68mm ISO threaded BB shell. The same thing as half the road bikes on the planet. You took a Shimano out, put a Shimano back. This is a two minute process. Just confirm that it is a 68mm BB and not a 73mm, which would be really odd for a CX bike.

-- Jay Beattie.


https://www.bing.com/images/search?v...vt=0&eim=1,2,6


Groan. That is a CONVERSION BB for using BB386 crank on an ISO/BSA threaded BB frame. A standard BB386 BB is a press-fit format for 46mm bore BB shell.. https://www.youtube.com/watch?v=U66bVfZeLyk

Don't be opaque. Answer the following two, simple questions:

1. What is the width of the BB shell?
2. Is the shell threaded?

If you have a 68mm threaded BB shell and a BB-MT800 (NOT PF) BB, then throw in a Shimano road crank and stop this insanity. If it is 73mm, use a Shimano mountain crank -- like the one you took out. This should take five or ten minutes tops and not days of bizarre speculation.


-- Jay Beattie.
  #7  
Old December 5th 19, 11:57 PM posted to rec.bicycles.tech
Tom Kunich[_5_]
external usenet poster
 
Posts: 1,231
Default Damn BB Problems

On Tuesday, December 3, 2019 at 4:27:50 PM UTC-8, Tom Kunich wrote:
I have a Redline cross bike and it had an XT crank on it that had a 24-38 rings. The bottom bracket appears to be an XT also but the only thing on it was "mountain" on both sides and the markings are "BB-MT800".

I pulled off the cranks and tried to replace them with a Reynolds 24 mm shaft compact chainset I tripped across while I was looking in my parts bin(s)

When I inserted it, I discovered that the end cap of the Reynolds crank was missing. Also it appears that the crank is about a 1/4th inch too short for that bottom bracket.

Tearing the universe apart I still haven't found the endcap which is smaller thread than the XT crank.`

So I need to figure out what BB the Reynolds is supposed to use. The Reynolds site was no help. Plus I can't find out what the size and thread of the endcap is and they make enough 2nd manufacturer end caps that they probably make one that will fit for $5-6.

Anyone got any information on these things?


BTW for anyone that is interested - the 24 mm shaft isn't as stiff as the 30 mm one but the BEARINGS are a lot better.

The FSA MegaExo has changed their shaft from 24 mm to 19 mm for who the hell knows why? Maybe that allowed them to use a standard instead of a custom bearing.

Shimano hasn't responded to me about whether their road groups will fit an oversize BB shell.
 




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