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There are adequate post-war verified numbers to be able to date frames quite accurately. After the war the company started to use a numbering system that started with the prefix letter “K”, followed by numbers, which did not go beyond 999. There are no records yet of four figure numbers following the letter prefix. Once the numbers reached 999 the company went on to use the prefix “KA”, followed in sequence over the years by “KB, KC, KD, KE”. There are no known recorded letter combinations beyond “KE”. Adverts found in the January 9th 1925 and August 14th 1925 issues of Cycling magazine for the Featherweight Cycle Co. range of complete cycles show the company trading at 366 Upper St. This would indicate that Macleans took over the Lightweight Cycle Co. and soon after incorporated the word “Lightweight” into their own title. By September 1926 an advert shows Maclean’s Featherweights being advertised.
is sold in Arabia, so things can get moved to unexpected places. I took my Meco to Italy, and it did not In 1934 they moved a few doors up the road to occupy 362-3 Upper Street, where they remained until the business was wound up in 1962 and passed into the ownership of Holdsworthy Cycles. First used on the brand’s SuperX ‘cross bike, the standard works in exactly the same way as BB30A, but sees the shell ballooned out to 83mm wide, improving tyre clearance and, supposedly, stiffness. Specialized‘s OSBB system is nearly identical to BB/PF30 but with a few key differences, according to the company’s director of advanced research, Chris D’Aluisio. With the front wheel further out front, there’s less chance you’ll dive over it. The seat angles of both bikes are steep so the front wheels aren’t so lightly loaded that they’ll snow-plough through turns or lift up on climbs.
The ride
Holdsworthy produced small numbers of “Maclean” badged cycles throughout the 1960’s, these being re-badged versions of their own range of frames. Thus a 1960s Maclean frame could also be found with Holdsworthy or Claud Butler badges.
Other notes Asymmetric BB shell which is wider on non-driveside. Wider overall shell is also claimed to improve bearing support PF30 Pros: Same as BB30 but with lower costs, easier assembly, and the potential for additional bearing seals integrated into the cup/bearing assembly Effectively, the space previously taken up by the bearing cups can now be used as frame real-estate, allowing larger (and stiffer) tubes to be used. If you have above-average strength, you may reach 40 Nm or more. That’s fine. Achieving the minimum torque is the main thing. Because you have aluminium threads and surfaces, you can face the shell with a cutter and make it parallel if it is not. The bearing bores are usually round already, with aluminium cups, because it is a machined surface, and if the bearing bores are too tight you can sand them out and get the fit just right for the bearings before you thread them into the frame. You cannot use a facing or cutting tool that I know of in a carbon shell.”
PF30A and PF30-83 Ai bottom brackets
BB386 EVO and BB392 EVO, introduced in 2011, take the oversized principle to extremes. The bearings have the same 86/92mm spacing, width-wise, as conventional threaded external BB, BB90/95, and PF86/92 formats, but it uses BB/PF30’s bigger 30mm diameter spindle. A tapping and facing tool is the way to achieve this. Cutting Oil for the Tapping Dies and Facing Blades I note that 'problem solvers' sell an aluminium cup to replace the plastic one that comes with some shimano BBs. They sell despite costing as much or more than the BB they fit to....
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