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, 05:01 PM
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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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The head tube diameter is always going to be larger than the steer tube diameter. As well, the ad doesn't specify whether that is the inside or outside diameter of the head tube. If that is the inside diameter, the frame is designed for a 1 1/8" steer tube. If that is the outside diameter, the the frame likely needs a 1" steer tube
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03-29-23, 09:54 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
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03-29-23, 01:57 PM
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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
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