G30 Cranks

• It depends on the type of bottom bracket shell your frame has.  We make bottom brackets to fit BSA, T47 external, T47 internal, PF30, and PF86/92 bottom bracket shells.  Once you determine which style you need, order that bottom bracket with the 30mm spindle/bearing option to fit the G30 crank.
• The chainring depends on 1x or 2x set up, and what chainline you need.  Chainline is determined from frame specs and rear axle spacing which is available from the frame manufacturer. Once you get this info, navigate to the correct Chainrings page on our website.
  • 1x MR30 TSR 3mm offset ring for 46.5mm chainline
  • 1x MR30 TSR Boost/0mm offset ring for 49.5mm chainline
  • 1x MR30 TSR 3mm offset ring (flipped outward) for 52.5mm chainline
  • 2x v2 VBC rings for 45mm chainline (measured between the rings)

• How can I figure out if the G30 crank will fit my bike?
  • Generally speaking, if you are replacing a SRAM or Shimano road or gravel crank, the G30 will fit fine.  The G30 is designed with standard dimensions and chainlines that fit “most” road and gravel bikes.  Your frame’s manufacturer should have some basic guidelines on what type of crank you need, i.e., “Mountain”, Road”, or “Gravel”.  If they say it will fit a Shimano or SRAM road or gravel crank, you’ll be fine.  If you have a custom frame or you’re not sure, get out your calipers and read on….
  • There are three basic measurements/clearances you need to confirm (digital calipers are best for this):
    • Bottom bracket OBW (Outer Bearing Width) when mounted (with seals) does not exceed 91mm
      • Add the shell width to the width of the cups with seals, or mount the BB (with seals) and measure the width
    • Crank arms don’t hit the frame
      • The chart above has the “Width between crank arms for chainstay clearance” measurement of 144.6mm for the G30 crank
        • Outside width of the chainstays measured at 190mm (that’s about the end of the crank arm) behind the BB center can be no wider than 132.6mm.  That gives you at least 6mm of clearance between each arm and the chainstay. (144.6mm – 132.6mm)/2 = 6mm
    • Chainring doesn’t hit the frame
      • Determine which of the four chainlines you need (Non Boost 46.5mm, Boost 49.5mm, 52.5mm for ?, or 2x VBC 45mm)
      • Determine how many teeth you want
      • Now check out the “MR30 Crank and Chainring Dimensional Drawings” document below
      • Find the “Y2” dimension (that’s the radius of the chainring) for the chainring size/teeth you want
      • Measuring from the center of the BB shell, put a pencil mark at the Y2 dimension on your chainstay (this is where the chainring teeth will pass the chainstay)
      • Measure the outside width of the chainstays at this spot, and divide by 2.
      • Subtract this measurement from the chainline number you chose, and this gives you your chainring to chainstay gap/clearance
      • Ex: You want to run a 3mm offset (facing inward) 44T 1x TSR ring
        • Your chainline will be 46.5mm
        • The Y2/radius measurement for the 44T ring is 94.2mm
        • Let’s assume your chainstays are 79mm wide measured at 94.2mm behind the BB center
        • 46.5mm – (79mm/2) = 7mm.  This is the gap between the ring and your chainstay
          • 5mm would be the minimum gap we’d like to see between the ring and chainstay, more if your frame is really flexy
      • If your frame has asymmetrical chainstays you’ll have to figure out a different way to measure for chainring clearance

It depends on the type of bottom bracket shell your frame has.  We make bottom brackets to fit BSA, T47 external, T47 internal, PF30, and PF86/92 bottom bracket shells.  Once you determine which style you need, order that bottom bracket with the 30mm spindle/bearing option to fit the G30 crank.

• Yes, as long as it has a 30mm bearing and the OBW (Outer Bearing Width) when mounted (with seals) is no wider than 92mm
• For Chris King bottom brackets refer to the “Chris King Bottom Bracket Spacer Chart” below

• If you use one of our bottom brackets you will not usually need spacers
  • Refer to our bottom bracket pages for specific spacer info for your type of bottom bracket
• For other brands of bottom brackets you will need to determine the OBW (Outer Bearing Width) when mounted (with seals)
  • Compare that number to the 91mm +/- 1mm OBW of the G30 crank
    • If the OBW of your bottom bracket is wider than 92mm, it will not work with the G30 crank
    • If the OBW of your bottom bracket is narrower than 90mm, you will need a 30mm spacer kit available under Parts>Bottom Bracket Parts>Bottom Bracket Spindle Spacer Kits.  Add an even number of spacers on each side to take up the difference
• For Chris King bottom brackets refer to the “Chris King Bottom Bracket Spacer Chart” below

The only one we’re aware of that fits is the Wolf Tooth “CAMO Direct Mount Spider For White Industries” chainring system

Yes.  The G30 has a similar chainline to Shimano and SRAM road cranks as well as Shimano GRX and SRAM gravel cranks so most of the time the G30’s work great on road and gravel bikes.  But to confirm, please refer to the “How can I figure out if the G30 crank will fit my bike?” FAQ above.

Use “Mothers Mag and Aluminum Polish” with a microfiber rag.  Start with heavy pressure and lighten up towards the end

Go to the Parts>Crank Parts page

We do not offer them and are not aware of any that are compatible.

It’s certainly possible if you can find one that is compatible with our crank, but as of now we’re not aware of any that are compatible.