Gary Fisher and Klein press-in bottom bracket bearings
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Gary Fisher and Klein press-in bottom bracket bearings
To Bike Bottom Bracket Conversion Adapter 1 Pair Bicycle Black Durable...
https://www.ebay.com/itm/To-Bike-Bottom-Bracket-Conversion-Adapter-1-Pair-Bicycle-Black-Durable-/363521812400?mkcid=16&mkevt=1&_trksid=p2349624.m46890.l49286&mkrid=711-127632-2357-0
Any chance something like this would work on an old Fisher bike with the square taper bottom bracket with press in bearings? Saw these on eBay and thought I could update to a more modern crankset?
Thanks for any additional information.
https://www.ebay.com/itm/To-Bike-Bottom-Bracket-Conversion-Adapter-1-Pair-Bicycle-Black-Durable-/363521812400?mkcid=16&mkevt=1&_trksid=p2349624.m46890.l49286&mkrid=711-127632-2357-0
Any chance something like this would work on an old Fisher bike with the square taper bottom bracket with press in bearings? Saw these on eBay and thought I could update to a more modern crankset?
Thanks for any additional information.
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I forget the Fisher BB shell ID or how that compares to the BB30 shell ID. One aspect I believe I see is that this adaptor depends of the bearing preload to hold the adaptors in the shell, unless the adaptors are also a press fit into the shell. Interesting the listing has a reference to tolerances "2. Please allow slight manual measurement deviation for the data." that makes me wonder. That and the need for O rings to insure contact. Andy
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I forget the Fisher BB shell ID or how that compares to the BB30 shell ID. One aspect I believe I see is that this adaptor depends of the bearing preload to hold the adaptors in the shell, unless the adaptors are also a press fit into the shell. Interesting the listing has a reference to tolerances "2. Please allow slight manual measurement deviation for the data." that makes me wonder. That and the need for O rings to insure contact. Andy
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The crank interface is square-taper. That means your Fisher has a BSA threaded BB shell. The most straightforward and reliable upgrade path would be to use the BSA-threaded outboard bearings that are appropriate for the crankset you choose. In other words, upgrade around the crank, not some bearings you happened to find. Hollowtech II for Shimano, GXP for SRAM and Raceface, or FSA for FSA. Owners of bikes with press-fit bottom brackets covet your threaded BB shell. Take advantage of that.
https://www.ebay.com/itm/23353054596...IAAOSwXj9fV55b
https://www.ebay.com/itm/12436694707...sAAOSw2kVhJWcb
I think the shell size is 35mm-ish, certainly not much room for BB30 cranks. Maybe Shimano/SRAM 24mm?
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And these cartridge press fitted bearing BBs is what I thought the OP was referencing. IIRC the shells of these early MtBs were close to the same OD as threaded shells are. So a 42OD bearing won't come anywhere near close to fitting, of an adaptor made for this 42mm press fit shell won't come close. Andy
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[QUOTE=wesmamyke;22204785]The OP is probably not imagining things. Fisher, Klein, Fat chance and some others used press fit bearings with square taper spindles. The spindles are straight and held in with locking colars.
/QUOTE]
I came across a years-old thread in this forum on this. Here's the link. https://www.bikeforums.net/bicycle-m...-question.html
There was a reference to a youtube video, too.
It uses standard 6003 (17x35x10) bearings and a proprietary spindle. Any upgrade will have to involve the original spindle, as 35 mm is larger than 1.37".
/QUOTE]
I came across a years-old thread in this forum on this. Here's the link. https://www.bikeforums.net/bicycle-m...-question.html
There was a reference to a youtube video, too.
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Interesting that they actually had a spindle that wasn't just dead straight. It's possible I've only taken apart Fat Chance BB's with the locking collars.
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The SRAM PF30 takes a straight shaft crank & relies on the BB face with the DS & NDS assemblies to bottom out, as well as preload washers with seals to minimize lateral movement. Maybe something in that order could be found to work?
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This 30 year old technology allowed using any crank, from multiple manufacturers, without any proprietary design, to be used. Sure a straight through design would have worked with a different design complicating things. The design used let you use any crank that spindle length accommodated without any extra parts or instruction.
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Are you on any bicycle Facebook groups?
Every couple weeks someone (maybe multiple, maybe the same guy) posts up that he is a precise machine fabrication type. He’s looking for projects. I love the sentiment but have nothing for him I needs.
It would be reasonable to believe that he could build press-in cups that would accommodate bearings off a gutted BSA cupset.
I don’t know about spindle length being in the ballpark or not. Do some homework I suppose.
It seems like you can do it. Possibly not weather tight.
I don’t know what a single custom fabrication like that would cost though.
Every couple weeks someone (maybe multiple, maybe the same guy) posts up that he is a precise machine fabrication type. He’s looking for projects. I love the sentiment but have nothing for him I needs.
It would be reasonable to believe that he could build press-in cups that would accommodate bearings off a gutted BSA cupset.
I don’t know about spindle length being in the ballpark or not. Do some homework I suppose.
It seems like you can do it. Possibly not weather tight.
I don’t know what a single custom fabrication like that would cost though.
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