Tech Breakdown: How 135mm Rear Hub Spacing Affects Road Bike Chainline & Shifting
Early disc brake bikes, especially cyclocross bikes, had 135mm rear dropout spacing, before thru axels came out.
Early disc brake bikes, especially cyclocross bikes, had 135mm rear dropout spacing, before thru axels came out.
Explanation of all bike hub types.
Table of hub/cassette spacers.
Bike part standards.
Lots of information on calculating cog pitch, pull ratio, cable pull for derailleurs and shifters.
Huge spreadsheet with data on 10-12 speed parts and compatibility.
9-11 speed shimano road derailleur info.
10/11 speed chain sizing.
Details on mixing 8-11 speed road parts.
Shifter/Cassette/Derailleur/Chainrings compatibility.
Alternate shift cable routing for old dura ace lever and new derailleur.
Dura ace timeline.
With a large cassette up to 51t, a 1x12 drivetrain climbs any hill and has enough speed to go as fast as you want.
Gravel bikes paved the way for 1x systems, desiring simpler drivetrains and not caring as much about steps in cadence. The additional gears makes that less of an issue anyway.
New hub types from Shimano (microspline) and Sram (XD) allow for a 10t top gear. This lets you have a smaller max chainring in front, which fits closer to the frame.
The frame determines a bike's type and geometry.
Frames have attachment points that allow or limit which parts you can use.
Frames come in different materials and designs, which determine rider position and tire clearance.
Determines the headset, fork, and stem options.
VIntage bikes: 1"
Modern bikes: 1 1/8"
Various sizes.
Older 10 speed style road bikes are 100mm in the front and 130mm in the rear. 90s style mountain bikes are 100mm in the front and 135mm in the rear.
Now there is Boost and Boost+ standards, and quick release skewers and through axles. You can convert a through axle wheel to use quick release skewers, but not the other way around.
Over Lock-nut Diameter (OLD) is the distance between the outside of the lock-nuts on a hub. This matches the width on the frame's fork and rear dropouts.