Screw-Fit 46 mm Bottom Bracket - SF46 (Monocrome)

Availability: In stock

SKU:MCISF46

Monocrome Screw-Fit 46 mm Bottom Bracket for replacement and upgrade of press-fit 30 mm (PF30) bottom brackets.  Designed and engineered here at Shockcraft to solve fitment, creaking and bearing life issues.

FIts Mountain Bike frames with 73 mm BB Shell width.
Fits Road & Cyclocross frames with 68 mm BB Shell width by removing internal spacer.

Installs and removes with an IceToolz 11D3 tool, Park BBT-18 tool or equivalent used for ISIS bottom brackets and crank spiders.

$125.00

* Required Fields

$125.00
Description

Details

Monocrome Screw-Fit 46 mm Bottom Bracket for replacement and upgrade of press-fit 30mm (PF30) bottom brackets.  Designed and Engineered here at Shockcraft to solve fitment, creaking and bearing life issues.

Takes standard 6806 bearings with aluminium caps and o-ring seals.

Bearings available in Chromium Steel, Stainless Steel or Ceramic Hybrid.

Fully rebuildable and upgradable.

Bearing Warranty: 
6 months for Chromium Steel or Stainless Steel bearings without CNC Storm Drains
12 months for Stainless Steel bearings with CNC Storm Drains.

Installation:

Unscrew the two cups from the centre sleeve and ensure grease is applied to the orings (right around) and the threads (one stripe across is enough).
Suitable greases include Slickoleum and Motorex Bike Grease 2000.
For MTB installation (73 mm wide shell) use one 4.5 mm spacer in one cup.  Thread that side on the centre sleeve to trap the spacer in position.
For road installation (68 mm shell) discard the internal 4.5 mm spacer.

Lightly grease the 46 mm diameter seating surfaces on each cup.

Slide the cup with the attached centre-sleeve into the BB and use a soft-faced hammer (plastic, rubber or wood) tap the edges of the cup to seat it square into the frame enough to start the engagement.  Ensure the centre sleeve visible from the other side is concentric.

Thread the other cup in from the other side with your fingers.  Once it has engaged the threads and pulled up you can use a tool (IceToolz 11D3 or Park BBT-18) to tighten and pull both sides in.

40 Nm is the required torque.  A 32 mm socket & torque wrench can be used with the IceToolz 11D3.  There is however no torque wrench fitting on the Park BBT-18.  You can get a feel for 40 Nm by trapping the square drive end of a torque wrench in a vise and feeling the force required on a similar length lever.

If the BB doesn't seat easily, it is better to remove and regrease before trying again.

Additional Information
CNC Storm Drains:

For those riding in wet conditions Monocrome Bottom Brackets are available with CNC Storm Drains. These water drains allow water to escape from the cup before it can corrode or enter the bearing. The drains are invisible once the bottom bracket cups are assembled.

BB Cup with CNC Storm Drains from Shockcraft
Bottom Bracket Cup with CNC Storm Drains

Bearing Type:

Chromium Steel (Monocrome):
Chromium steel caged deep groove ball bearings.  As with all MonocromeTM bearings, these bearings carry a special guarantee with a 6 month no questions asked replacement.

Stainless Steel (Monocrome):
Stainless steel caged deep groove ball bearings.  When purchased with CNC Storm Drains these bearings carry a special guarantee with a 12 month no questions asked replacement.  When purchased without the CNC Storm Drains the standard MonocromeTM 6 month guarantee applies.

Ceramic Hybrid (Enduro):
Ceramic hybrid caged deep groove ball bearings.  Ceramic hybrid bearings have a conventional steel outer race but with ceramic balls inside.  The harder ceramic balls roll a little easier, weigh a little less and the bearings have been designed to minimise rolling friction.   These are ideal bearings for those seeking higher performance and lighter weight.