Best Bike Bottom Brackets of 2026

DUB is SRAM's own spindle standard, and it's the one part of the decision no bottom bracket can work around. A 24 mm crank won't go into a DUB bracket and a DUB crank won't go into anything else, so if the arms on your bike carry that marking, the shortlist is one name long and this is it.

We like this one for what comes in the box as much as for the bearings. The sealed cartridge sits behind SRAM's Gutter Seal lips, and the kit ships with 2, 3 and 4.5 mm spacers plus the chart that tells you which combination your crank and shell width want. Get that combination wrong and you'll spend a season chasing a chainline complaint you can't diagnose from the saddle.

Threaded installation is as straightforward as it gets — clean the shell, grease the threads, wind it in. The catch is money: you pay more here than for the Shimano, and the extra buys the correct interface rather than a smoother bearing. Worth it when DUB is what you own, wasted when it isn't.

Before anything else: the title on this listing calls it an 86.5 mm press-fit bracket. The bullets, the aluminum threaded cups and the part number — EBBMT501B — all describe an English-threaded mountain bike bracket, which is what an MT501 with that number is. Check the part number on the page you order from, because a press-fit frame is the one thing this bracket can't help with.

For a threaded trail bike, it's the value pick of this group. Aluminum cups take the abuse a plastic-cupped bargain bracket won't, the bearings are steel, and it threads in with the same splined socket as the rest of Shimano's outboard range, so there's no new tool to buy. For the money, we haven't found a reason to fit anything else on a bike that sees mud.

What you aren't buying is permanent silence. Outboard cups sit directly in the path of every puddle, and the seal is what decides how long the bearings survive. Fit it, ride it, replace it when it grumbles — at this price that's the honest expectation, and it's an easy calculation to live with.

The BBR60 is the right answer for Shimano cranks and no help at all if yours are Race Face, or another brand's 24 mm spindle that isn't Shimano's. That narrow question is exactly what the X-Type answers: Race Face builds it for its own X-Type cranks and states that it also fits most other 24 mm external mountain systems, which covers the common aftermarket options.

The kit is unusually complete — spacers for both 68 and 73 mm shells and instructions that actually explain the combination, which is rarer than it should be. Cranks spin freely before the chain goes on, the test we run on every bracket here, and this one passes it cleanly.

Where it loses ground is the price. You're paying for fitment, not for a bearing that outlasts the Shimano, and the sealed cups are no more serviceable than anyone else's. For a rider whose cranks leave no other option that's the cost of getting the bike right; for everyone on Shimano or SRAM, it's money spent on a problem you don't have.

Square taper is where a bottom bracket stops being a decision and starts being a measurement. The Mimoke comes in 113, 116, 118, 122.5, 124 and 126 mm spindles on a 68 mm shell, and that length is what sets your chainline — get it wrong and the cranks sit off-center, the front derailleur stops trimming cleanly, and you're paying return postage. Measure the old unit before ordering and this is the simplest, cheapest fix here.

The rest is undemanding. It's a sealed cartridge, so it goes in with a splined tool, needs no preload adjustment and keeps grit away from the balls in a way the open cup-and-cone it replaces never could. We fitted ours with no drama and nothing to tweak afterward, which is one of the quiet pleasures of a cartridge unit. Wet weather is where cheap bearings age first, so plan on this being a wear item rather than a lifetime part. Square taper's own trap is the crank arm: grease the taper, torque the bolt, and check it again after the first few rides, because a loose arm will chew the taper and cost you a crank.

This isn't a cartridge bracket and it never pretended to be. It's a cup-and-cone set for one-piece — Ashtabula-style — cranks: the hardware on kids' bikes, BMX cruisers and the American-built clunkers at the back of the garage.

You get the cups, the cone and locknut, and a set of loose ball bearings. Installation is old-fashioned in the best way: grease everything, seat the bearings, thread the assembly together, then adjust the cone until the crank turns free with no side play and lock it down. There's no press involved, no splined socket to hunt for, and nothing sealed to fail quietly.

For a bike that's worth fixing and not worth upgrading, that's exactly the right trade, and we rate it for the repairability alone — next winter you can repack it with fresh grease instead of binning it. Match the cup size and thread to the old set before ordering; this is the one place in the roundup where the size on the page matters as much as the type.