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Syncros Bottom Brackets


Our Canadian friends at Syncros make a precision built, sealed bearing bottom bracket with a Titanium spindle. The Syncros Pro Series B/B is the more traditional of their two "dual adjusting cup - fixed length spindle" type B/Bs permitting fine lateral adjustments in the spindle for a perfect chainline. The Spindle is machined from Ti 6Al-2Sn-4Zr-6Mo Titanium rod.

The piece is well machined with tapered ends for easy arm installation. Turned on a lathe, the spindle has a flat rise making a shoulder for the bearing cartridge to be pushed against and seat to. The sealed bearing cartridges are machine pressed onto the spindle. After the first bearing is in place, a machined Black plastic water sleeve, slides into place over the spindle and the second bearing is pressed into place. The water sleeve has recessed O-rings at each end that seat into the aluminum bearings cups. Between the two bearings, the spindle is turned to a narrower diameter, reducing its weight. The spindle is drilled through with threads tapped for the crank bolts. Each of the aluminum bearing cups is machined from aluminum rod. The cup piece is bored from the inside so the sealed cartridge butts against the outer cup wall.

On the outside each cup has 6 holes drilled into the surface for a pin spanner to make the final cup adjustments. There is a recess with an O-ring installed where the spindle exits the bearing cup to reduce contaminants from outside. The lockrings for each cup are machined from 3.65mm thick aluminum plate, with 6 cuts for the B/B spanner wrench to grip while tightening. The left lockring is anodized Gold and the right is anodized Black.

The Syncros Pro Series B/B uses French made SKF bearings, model 61903-2RS. It comes with English threads, with spindle lengths of 103mm, 105mm, 107mm, 109mm, 111mm, 113mm, 117.5mm, 122.5mm, 127mm, or 131mm. The weight of Syncros Pro Series B/B 122.5mm spindle is 171 grams. Crank bolts are not included.

Spindle-03-05-07-09-11-13-17-22-27-31/T You need to call for price


The Hardcore is very similar to the Pro Series in construction and technique. It uses the same spindle with a water sleeve between two pressed on bearings. The bearing cups are machined from aluminum alloy rod and house the bearings in the same manner. The cups have O-rings at the spindle exits and use the same lockrings.

The cups have an anodized Grey/Silver appearance. They are slightly longer, at 18.43mm, than the 16mm wide Pro Series cups in order to house bearings that are slightly wider than those used in the Pro Series. The Pro Series uses a 7mm wide cartridge bearing that houses a single set of ball bearings within a tiny plastic retainer between an inner and outer steel tube that serve as races.

The Hardcore uses 10mm wide cartridge bearings that enclose two sets of ball bearings, each in their own plastic retainer. The two retainers are sealed side by side, and the same wider inner and outer tubing races. The added bearings and their contact surfaces displace the load over a greater area on the spindle. The wider bearing is also intended to minimize flex in the hollow Titanium spindle. The bearing is made by INA and the seal is marked 61903RS and the inner race bears the marking 3903 2RS C3. The water sleeve for the Hardcore is made of White plastic.

It comes with English threads, with spindle lengths of 107mm, 109mm, 113mm, 117.5mm, 122.5mm, 127mm, or 131mm. The weight of 127.5mm Syncros Hardcore B/B spindle is 190.5 grams. Crank bolts are not included.

Spindle Length-07-09-13-17-22-27-31 /T You need to call for price

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