- 1 How wide is a fat bike bottom bracket?
- 2 What is a good bottom bracket height?
- 3 How do I determine bottom bracket spindle length?
- 4 How do I know what size crankset to buy?
- 5 Do I need spacers on my bottom bracket?
- 6 Is my bottom bracket Press Fit?
- 7 Does Shimano make a fat bike crankset?
- 8 What does BB mean on bikes?
- 9 How does bottom bracket height affect handling?
- 10 What is considered a low bottom bracket height?
- 11 Does spindle length matter on bottom bracket?
- 12 Are bottom brackets all the same size?
Wheels Mfg Fat Bike PF30 bottom brackets are for use in bottom bracket shells with a 46mm ID and 100mm wide. Our bottom bracket consists of two machined cups with sealed bearings pressed in.
With 170 mm cranks, a 10 ½ inch bottom bracket height is a good starting point. Road racing will require a slightly higher bottom bracket due to the need to pedal through some turns. 10 ¾ inch bottom bracket height is a good starting point if you are using 170 mm cranks.
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.
How do I know what size crankset to buy?
The crank length represents the distance between the centre of the bottom bracket and the centre of the pedal axis. The most common lengths are 170, 172.5 and 175 mm, but it is possible to find cranks between 165 and 180 mm in the market.
Much like GXP, you don’t need to add any spacers to the bottom bracket if you have a 73mm shell, but you will need to add a 4.5mm spacer to the right-hand side of the crank axle, unless you’re using a chain guide, in which case a 2mm spacer is required instead, along with a 2.5mm spacer on the right-hand side of the
Press fit bottom bracket frame shells use a simple bore with no internal threading. The bearing or bearing cup will be slightly larger than the bore of the frame and is pressed inside the shell. This creates an interference fit, also known as a press fit.
Does Shimano make a fat bike crankset?
Shimano themselves don’t seem to make a fat crank all the other brands seem to be the taper spindle, that I specifically don’t like mechanically.
What does BB mean on bikes?
The bottom bracket is a bicycle component used to connect a bicycle’s crankset to its frame, allowing it to rotate independently of the frame itself.
The higher the bottom-bracket height, the higher the centre of mass of the rider, and so the more the bike tends to pitch when faced with bumps, hard braking or steep gradients. In this sense, a lower bottom bracket improves stability in much the same way as a longer wheelbase.
Road bikes usually have a BB drop of between 65-75mm. Most road bikes designed for racing and 23c tires fall between 70-68mm. Increasing BB drop just a few millimeters can substantially increase the stability of a bike by positioning the rider lower within the confines of the wheel’s center axis.
The critical thing is your spindle length: as long as you can set up the correct chainline you will be good to go. But, again, best never to mix standards if you can at all avoid it. If you are looking to replace a cottered crank setup with a square taper setup, then look no further than a cartridge bottom bracket.
There are 4 widths available with BSA bottom brackets; 68mm, 73mm, 83mm or 100mm. For road bikes, a BSA bottom bracket is always 68 mm wide. Other sizes, and particularly the 73 mm width, is commonplace with mountain bikes. The 83 mm and 100 mm dimensions have become rare these days.