What Size Bottom Bracket Do I Need For My Mountain Bike?

What is the best bottom bracket for mountain bike?

Best MTB bottom brackets

  • Chris King Threadfit. The best from a boutique bottom bracket maker.
  • CeramicSpeed MTB Bottom Bracket. Unequalled performance – at a cost.
  • Enduro BB86 /92 TorqTite. The bearings masters make their own bottom bracket.
  • Cane Creek Hellbender 110.
  • Race Face Cinch.
  • Shimano XTR.

How do I determine bottom bracket spindle length?

The best way to find out which spindle length you need is by looking up the specs. (The alternative is trial and error…) Spindle length and the resulting chainline have some leeway. If you are within 2-3 mm of the “correct” 43.5 mm or 45 mm, you are doing quite well.

What is a 68 73 bottom bracket?

68mm is the bottom bracket shell width. 118mm is the spindle width. Many external bottom brackets are compatible with both 68mm and 73mm shell widths. They’ll usually include spacers with diagrams telling you which spacers to use and where, depending on which BB shell width you have.

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Do all cranks fit all bottom brackets?

Crankset compatibility In general terms, most cranksets can be fitted to a variety of bottom bracket shells, though much of this compatibility depends upon the availability of suitable hardware (see next section). Any incompatibilities that do arise are often related to the length and/or diameter of the crank axle.

How do I know what size crankset to buy?

Crank length: This is measured from the centre of the bottom bracket axle to the centre of the pedal axle. Most stock bikes have cranks of 170mm or 175mm, but you can get them as short as 140mm and as long as 190mm. Choose crank arms that suit your inside leg measurement for optimum comfort and control.

Are Tange bottom brackets good?

Tange makes a good one for not too much money. Design and quality is equivalent to the old higher end Shimano square taper units. Thanks again – I looked into them, and see that the Tange Seiki LN-7922 is what I’m looking for. These would be the equivalent of the Shimano UN-72/73 BB’s.

How much difference does a good bottom bracket make?

The best sample generates just 0.29W of drag while the worst one records a still- good 1.64W – with just 1.35W in total when comparing average values. In addition, the average drag for all of the bottom brackets tested is just 0.77W.

What does BB mean in bikes?

The bottom bracket on a bicycle connects the crankset (chainset) to the bicycle and allows the crankset to rotate freely. It contains a spindle to which the crankset attaches, and the bearings that allow the spindle and cranks to rotate. An old American term for the bottom bracket is hanger.

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Does bottom bracket spindle length matter?

Nope, it mostly depends on the design of the crank arms. Years ago, crank arms were pretty much straight up and down and BB spindles were in the 120 mm’s. More modern square taper crank arms are offset to the point that some require BB spindles less than 110 mm.

How long does a bottom bracket last?

Properly adjusted, and discounting weather related factors, all the bearings on a bike should last close to forever. Back in the bad old days of “primitive” steel spindles and threaded cup bottom brackets, most would outlast the bike, or 25-50,000+ miles.

What is the difference between a 68 and 73 bottom bracket?

68 / 73 means the bottom bracket will work in both 68mm and 73mm bottom bracket shells. If the frame’s BB shell is 73mm, you use the bottom bracket alone. 68 / 73 means the bottom bracket will work in both 68mm and 73mm bottom bracket shells. If the frame’s BB shell is 73mm, you use the bottom bracket alone.

Are bottom brackets universal?

However there are many different sizes and iterations according to manufacturer – BB30, PF30, BB90,PF86/92 to name but a few – and not all are interchangeable.

Can you remove a bottom bracket without tool?

Almost anything can be taken apart without proper tools, including bottom brackets. it, but it can be done. The right tool for the job(any job) makes life much easier and will lower your frustration level by leaps and bounds. If it is a Square taper, isis or octalink then no.

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