Updating older bottom brackets
Updating older bottom brackets - dating ron restaino
Commonly referred to as “one-piece” Ashtabula cranks, these are made of one solid metal piece, meaning the left crank, the axle, and the right crank are all one piece, held in place by cups pressed into the bottom bracket shell.If you still have an older bike or even a newer children’s or department store bike, chances are you will be able to find one of these on there.
Now, Cycl Art vintage bike tech Greg Reiche has formulated a “best of both worlds” package.
We broke down every type of bottom bracket you are likely to encounter and present them in a simple, easy to understand format.
From mountain to road, threaded to pressed, and integrated to external, it’s all here… Bottom bracket compatibility is one of the most confusing topics for amateur and seasoned cyclists alike. There was one bottom bracket design, and it was strong, durable, and easy to service.
An explaination of the different bottom bracket tapers can be found here. The less common of the three tapers offered is the JIS low profile, which is used in some specific older-model Dura Ace cranks.
In brief, most modern cranks will take the JIS (Japanese Industrial Standard) taper, in addition to Campagnolo cranks produced before 1994. We recommend that a light film of grease be applied to the taper.
Since 1976 Cycl Art has rebuilt thousands of bikes; some with purely “correct” vintage parts suitable for collector’s shows, some state-of-the-art bikes, and mixes of old and new.
You know you like the fit, comfort, durability and classic look of your frame.
This hugely important and delicate assemble is always in harms way for a variety of reasons.
It is close to the ground and splashing water can easily enter the cavity causing delicate internal working to rust.
The bottom bracket (BB) consists of a spindle which goes round and round.
The bicycle's cranks are attached directly to the spindle.
Make sure both the frame and the cups are free of grease before applying the thread retaining compound.