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This performance boost comes with no other changes to basic dimensions: the left bearing stays in the same spot; the aluminium cup is simply replaced with carbon frame now. And since the bearing’s in the same spot, the lateral position of the left crank isn’t changed at all, so Q-factor is also unchanged. Your feet are in exactly the same place as before.” Terry has had riders winning time trials on his frames since 1980 including competition records and national championships. “We know how to make a bike fast†says the designer of the frame who has been involved in designing bikes to win Grand Tour Prologues, the Grand Prix des Nations and setting Hour records. All that experience over the years has come together in this one frame. The idea is simple, by moving the bearings outboard of the shell, you can then use a much larger spindle. Currently, 24mm is the accepted norm compared to square-taper’s relatively minuscule 17mm diameter. Folks abroad can silver braze fittings together to make their own adapters, and if their work is good, it Compatibility Originally designed for 24mm spindles, but some BBs that fit a 30mm spindle are available
First up, let’s look into a question that always comes up in relation to BB30—PF30 ARE BB30 and PF30 the SAME? The goal is to cut a maximum of 0.4mm of material away from the face. The 68mm or 73mm BB shell width should be preserved within 0.3mm of tolerance. I think it’s more about the simplicity of the manufacturing process,” says Drew Guldalian of Pennsylvania-based custom builder Engin Cycles. “Boring out a [standard] BB30 is not impossible, but in my opinion it’s an unrealistic task from a manufacturer’s standpoint that needs to do something to make money. As for the sealed bearings themselves they are identified as 6806bearings. This category of bearing has anBecause you are moving from an inboard bearing setup to an outboard bearing system you also need to clean or “dress” the BB shell’s face.
Here is one theory from BB Infinite including a very comprehensive summary. They cover the conventional wisdom on what to do about this as well as providing novel insight. Cons: Shell still just 68mm wide; metal-on-metal interfaces can be prone to creaking; requires a separate bearing puller and press for service; requires high manufacturing tolerances; bearing seats can’t easily be faced post-manufacturing At the time of writing there are no known records or proven information regarding the numbering of frames, both pre and post-war. However, there are adequate known numbers of post-war frames which have bills of sale that have allowed the verification of the numbering system used post-war. Once you fully insert the die on each side (or just one side if you have that type of tool), the next step is preparation for facing. The Facing Technique The externally located bearing cups interface directly with the BB shell. The bearing cups are precisely machined so the BB shell needs machining to the same level.Trek’s BB90 system uses the same bearings and bearing locations as a conventional threaded system, but eliminates the cups entirely. Bearings are pressed directly into precision-molded carbon seats Immediate Media Cervélo introduced the new BBright system on the R5ca, and while it offers some sound engineering advantages, other companies have been slow to adopt it Immediate Media Other names PF41 (Hope – refers to BB shell diameter), PF24 (Chris King – refers to spindle diameter)
Another former employee, Norman Penstone, who worked for the company between 1957 and 1961, said that the shop in Seven Sisters Road was only a retail outlet and that the frames were made in Camden Passage, Islington, behind the main shop at 362-3 Upper Street, Angel. He lists the staff as:- Shop Owners
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For us, there are no disadvantages versus a threaded design or a standard BB30. We are able to have a full carbon shell with no metal bonded into the frame, which makes for a stronger, lighter frame structure.
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