bobbyl1966

Can i use in modern road frames square taper bottom bracket and cranks?

TireLever-07

Yes,, with a cartridge Bottom Bracket. But depends on the BB Shell width. A 68MM wide BB was the most popular. I'm sure better mechanics will add more. But they say newer splined crank sets, are tougher, flex less, etc. chris

CACycling

Maybe. As I read your question, you want to install a square taper BB in a modern frame. It will work in many but there are a number of other "standards" out there now. Some can be adapted, some can not.

Homebrew01

If you have a BB30 frame, you will need an adapter sleeve to use a threaded BB.
I'm not sure what other modern BB type frames have adapaters back to threaded.

https://wheelsmfg.com/bottom-brackets...-adapters.html

So, the answer is 100 % probably, maybe

HillRider

If you know or can find out exactly what the current bottom bracket type is then a definitive way to use or adapt it to a standard English threaded bottom bracket can be recommended.

Point

Go ahead and put the square taper on and don't drink the kool aid with all the hype about "stiffer, better". Square taper was a great standard for a number of years and still works well. If it still holds up to track riders, it's plenty strong enough for just about everybody else. I've had fewer problems with the old cup and cone bottom brackets than the newer external type.

bobbyl1966

I have one road bike Cannondale R300 sealed square taper bottom bracket. Because the bottom bracket is get bad i want use bottom bracket with the external bearings and grease

HillRider

That works if the bb shell has a standard English or Italian threading. If it's BB30, PF30 or one of the myriad newer "standards", it's not that straight-forward.

bobbyl1966

How i can found what type of bottom bracket have my bike. I have two other road bikes and one TT bike i try found out what type of bottom bracket has.

JohnDThompson 

External bearing bottom brackets seem to have a shorter life span than traditional square-taper bottom brackets, either as sealed cartridges or loose balls, cup & cone type.

JohnDThompson 

Post some pictures, preferably with the crank arms removed to give a clear view of the bottom bracket.

SkyDog75

...and/or list the specific year, make, and model of the bike.

Homebrew01

Then that is threaded, and you can put in a replacement threaded BB. Either sealed or loose bearing.

Homebrew01

Or at least pictures at a 45 degree angle showing the type of cups used.

79pmooney

For your Cannondale with its square taper cranks: get the appropriate Shimano sealed bearing bottom bracket has the correct taper for the cranks and threads for your frame (both probable and any reputable bikeshop would know as will probably half the posters here Simple easy and those BBs are completely trouble free, immune to weather and last for years. $30. One special splined tool required. Park or Shimano almost anywhere. (That tool fits a lot of other stuff too.)

Can't help you with the modern BB. I find the old square tapers work well enough that why change?

Ben

Bezalel

While there may be some advantages to external bearings, longevity isn't one of them. If you post what you have now and possibly how it is going bad, perhaps someone can suggest a more robust BB that won't also require a new crankset.

bobbyl1966

No have pictures of the BB for i can post here. But what i have is i have one old steel bike too tall i cant ride that tall. I think i take out the BB and try in my cannondale. that bike have 52/42 crank. But i want use crank 53/39 i have in my other road bike. That crank is square taper is was 52/42 but i take out the rings and i install 53/39 rings

bobbyl1966

I have one aluminum Cannondale R300 road bike. I have tried to put square taper bottom bracket one i have is sealed the other one is old with external bearings and grease. The sealed one is fit in one side the other side is go halfway and then i cant screw anymore. I looks the threads looks okay. What is can be wrong. What type bottom bracket have the cannondale R300

Homebrew01

If it's threaded, then it's the standard English thread used in 90 % of threaded bottom brackets. But if you are taking a threaded BB from another bike, it could be part of the 10 % with Italian or other threading. Do the BB cups have thread sizes stamped on them ?
eg 1.37 x 24.
For English BB, the drive side (right side) has a left handed thread. The opposite of most threadings

https://www.sheldonbrown.com/cribshee...mbrackets.html

bobbyl1966

one bottom bracket i tried before is say 1.37x24. The bottom bracket i take from the cannondale i do the mistake when i moved put with other stuff i hope in the next few days i found. Is bad bottom bracket but i want see the number

bobbyl1966

i have one bottom bracket the one with external bearings and grease i buy with square taper crank 50/40 but is not fit

bobbyl1966

The cannondale R300 is aluminum 58cm seat tube 56cm top tube. The bike is maybe 1993 i not know i cant found info online when is made. Is weight around 23 pounds. Because is old frame is worth to try i upgrade or is better i look for other frame. The original wheels is was 7 speeds. i put wheels with 9 speeds cassete. is fit but i have pull the dropouts with my hands for make the wheel seat okay in the dropouts. That in the long run maybe break the dropouts?

cyclintom

Square taper:

There are in general two standards - Shimano/FSR/and most of the Chinese
------------------------------------------ Campagnolo

These ARE NOT interchangeable.

There are various widths of BB. While these depend on the manufacturer they are generally available only in two widths - double and triple cranks.

There are MANY different threads but they have generally boiled down to two sizes now - Italian and English. THEY ARE NOT COMPATIBLE. What's more, the English has reverse threads on the left side while the Italian has normal threads.

The older style semi-sealed bearing cups with the separate crank axle with the tapers has the lowest rolling resistance of any of the BB's on the market. It is also the most difficult to set up properly and is a genuine pain in the butt since it uses lock rings etc. All of the newer BB's with sealed bearings have drag from the seals themselves. This may not be a lot but even with ceramic bearings they have more drag than the older BB set up correctly.

bobbyl1966

I measure the frame is 68mm i use caliper tool. inside the threads is 37mm. For that measurement can i find the bottom bracket type? And how i found the spidle length is okay for my bike