Our line of products, which includes more than 3,000 references, fully complies with the new European Norm EN10253/3 and EN1092/1 requirements.

Len Phipps, owner of frame number KA996, which dates from early 1950 sent in a detailed drawing of the intricate lug-work, referring to it as an “Apollo” model. At this early date it could have been an example of a customer’s personal specification; in the absence of any available catalogue references to the Apollo model, it must remain as being a special build option that the company chose not to advertise widely. As for the sealed bearings themselves they are identified as 6806bearings. This category of bearing has an Pros: Stiffer than BB/PF30, in theory, without impacting other attributes; good crank compatibility, cheaper to manufacture than threaded or BB30 The crank pictured here is a FIRST Components model. The pinch bolts tighten to a recommended torque of 12-14 Nm.

e.g., Li et al. 2019). For the F– α relation, since F remains about constant and α becomes harder, the relation will shifts toward the right (see the arrows marked in Figure 4) but with almost the same slope. For the F– E c relation, since F remains about constant and E c tends to be smaller, the relation will moves toward the left (see the arrows marked in Figure 5) still with a same slope. For the E c– α relation, since both E c and α will change, the case could be more complicated. Generally speaking, the relation will move toward the top left direction (see the arrows marked in Figure 6), and the slope could also be changed with all possibilities (greater, less, and the same). On the other hand, stronger thermal components will results in greater α and E c changes, leading to more significant changes of the global parameter relations. More recently, bearings have shown up that allow a 30mm spindle to be used. The dimensional restriction mean the bearings are generally quite small, as the system was designed around 24mm spindles. This can lead to reduced bearing lifetimes. same goes for "B" fittings on a torch which needs to adapt to a hose with "A" fittings (Not recommended The Road Ultra was Reynolds 531 Butted Tubing with Ekla cast lugs, Campagnolo ends and Campag head and BB fittings. It had an exclusive reinforced fork crown and head lugs and seat-stay bridge.

The 30mm bearing is a good choice when using thinwall aluminium spindles,” he says, “and the narrow bearing stance (relative to outboard bearings) works perfectly with our carbon arm design needing to make the turn into the spindle. The OSBB is basically the same as BB30 but with a little tighter tolerances and a 0.5mm difference in the clip-to-clip dimension. Cranks of both systems are compatible with each other.” As stiffness is directly tied to cross-sectional size it’s no surprise that, theoretically, BB386 EVO has the most to offer, with both the added shell width and diameter that many frame-makers yearn for. The limited range is augmented by a wide range of build options and accessories; as well as their “specialising in building to customer’s own measurements”. BB shell width 86.5mm road, 91.5mm MTB. Other widths may be named according to shell dimensions: 89.5mm, 104.5mm, 107mm, 121mm, 132mm That extra 5mm can complicate crank compatibility, however. BB30-compatible cranks that feature axle spacers on the non-driveside (such as from Cannondale and SRAM) will work just fine because all you’ll have to do is remove spacers as needed to accommodate the extra width, but BB30 cranks without such spacers (such as from FSA and Specialized) won’t work.

BB86 and BB92 bottom brackets

To keep matters simple, we’ve put together a simple explainer on this slightly esoteric of standards here. The need for a heavier metal interface looked like a limiting factor for mass-produced carbon bikes, but with a manufacturer like Trek on now on board (as mentioned above, its 2020 Domane features a T47 BB) that could all be about to change.