Trek aluminum frame BB Question
03-28-23, 04:01 PM
#1
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Trek aluminum frame BB Question
I am interested in a vintage 26’er Trek MTB frame and want to build another bike. I am not an expert, but the close up of the BB doesn’t ring a bell - what looks like a tapered or conical BB. I am only familiar with threaded BB’s and cranks.
am I not seeing it correctly? Or is there a type of BB / crankset that matches this?
I hope the link works. If not - it’s an aluminum frame… and one side of the BB appears to be non-threaded. Your insight are appreciated. Thanks, again. Tom
(I’ll try to post the link again)… didn’t work
ps. Do I need to find a rear derailleur hanger for the frame? A steel derailleur hanger that bolts to the rear drop out? Similar to the Specialized aluminum frame I am working on at the moment.
https://www.ebay.com/itm/15545623561...oN10upGA%3D%3D
am I not seeing it correctly? Or is there a type of BB / crankset that matches this?
I hope the link works. If not - it’s an aluminum frame… and one side of the BB appears to be non-threaded. Your insight are appreciated. Thanks, again. Tom
(I’ll try to post the link again)… didn’t work
ps. Do I need to find a rear derailleur hanger for the frame? A steel derailleur hanger that bolts to the rear drop out? Similar to the Specialized aluminum frame I am working on at the moment.
https://www.ebay.com/itm/15545623561...oN10upGA%3D%3D
Last edited by Saddle Tripper; 03-28-23 at 04:09 PM.
03-28-23, 04:32 PM
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The description in the eBay ad says "English threaded BB". This is what I would expect from an older Trek MTB frame. I see a derailleur hanger in the pics.
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03-28-23, 04:44 PM
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Originally Posted by Saddle Tripper
I am not an expert, but the close up of the BB doesn’t ring a bell - what looks like a tapered or conical BB.
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03-28-23, 05:01 PM
#4
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Thanks! I am enjoying this ride. Tom
03-29-23, 12:55 AM
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Any thoughts about the 1-1/4” head tube and fitting a suspension fork?
I see more 1 1/8” forks and far fewer 1-1/4” forks. Do the 1 1/4” to 1 1/8 adapters affect fit quality or steering and handling? (I suspect not if installed correctly) but I don’t have knowledge to know better.
appreciate the help.
tom
I see more 1 1/8” forks and far fewer 1-1/4” forks. Do the 1 1/4” to 1 1/8 adapters affect fit quality or steering and handling? (I suspect not if installed correctly) but I don’t have knowledge to know better.
appreciate the help.
tom
03-29-23, 09:46 AM
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Originally Posted by Saddle Tripper
Any thoughts about the 1-1/4” head tube and fitting a suspension fork?
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03-29-23, 09:54 AM
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Originally Posted by Saddle Tripper
Any thoughts about the 1-1/4” head tube and fitting a suspension fork?
I see more 1 1/8” forks and far fewer 1-1/4” forks. Do the 1 1/4” to 1 1/8 adapters affect fit quality or steering and handling? (I suspect not if installed correctly) but I don’t have knowledge to know better.
appreciate the help.
tom
I see more 1 1/8” forks and far fewer 1-1/4” forks. Do the 1 1/4” to 1 1/8 adapters affect fit quality or steering and handling? (I suspect not if installed correctly) but I don’t have knowledge to know better.
appreciate the help.
tom
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03-29-23, 01:57 PM
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Originally Posted by Saddle Tripper
I am interested in a vintage 26’er Trek MTB frame and want to build another bike. I am not an expert, but the close up of the BB doesn’t ring a bell - what looks like a tapered or conical BB. I am only familiar with threaded BB’s and cranks.
am I not seeing it correctly? Or is there a type of BB / crankset that matches this?
I hope the link works. If not - it’s an aluminum frame… and one side of the BB appears to be non-threaded. Your insight are appreciated. Thanks, again. Tom
(I’ll try to post the link again)… didn’t work
ps. Do I need to find a rear derailleur hanger for the frame? A steel derailleur hanger that bolts to the rear drop out? Similar to the Specialized aluminum frame I am working on at the moment.
https://www.ebay.com/itm/15545623561...oN10upGA%3D%3D
am I not seeing it correctly? Or is there a type of BB / crankset that matches this?
I hope the link works. If not - it’s an aluminum frame… and one side of the BB appears to be non-threaded. Your insight are appreciated. Thanks, again. Tom
(I’ll try to post the link again)… didn’t work
ps. Do I need to find a rear derailleur hanger for the frame? A steel derailleur hanger that bolts to the rear drop out? Similar to the Specialized aluminum frame I am working on at the moment.
https://www.ebay.com/itm/15545623561...oN10upGA%3D%3D
03-29-23, 02:44 PM
#9
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Originally Posted by maddog34
why buy that when you can buy an entire similar trek bike for $75 to $200, depending on condition? Frame-only value is less than the shipping this seller is asking.... just saying....
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