how do I know this bb-un26 fits my Giant Sedona suntour 6061 bike can you let me know what size is needed so I can order thank you jack

you need to measure the bottom bracket shell and the spindle on the old bottom bracket (it is most likely a 68mm x 115-120mm bottom bracket but measure to be sure)here is an image http://www.peterverdone.com/wiki/images/5/5f/Hollowtech-II-3.jpgand a handy chart http://sheldonbrown.com/bbsize.html

Difference between this and un52?

UN52 is lighter, has smoother bearings and the cup is metal instead of plastic.

My bike has a tapered axle and 1/4" x 9 wheel bearings. Can this arrangement be upgraded to a square tapered sealed bottom bracket?

If the measurements and threading match., then yes. I've converted plenty of times.

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⚙️ Unlock pro-level pedaling power with Shimano 105 BB5500!

OPTIMIZED SHELL SIZE - 68mm English-threaded shell ensures a perfect fit for modern road bikes.
EXTENDED SPINDLE LENGTH - 109.5mm spindle length engineered for compatibility with multiple Shimano cranksets.
TRUSTED SHIMANO QUALITY - Backed by a limited warranty and engineered for professional-grade cycling performance.
LIGHTWEIGHT ALUMINUM BUILD - Durable yet featherlight aluminum construction keeps your ride fast and responsive.
PRECISION OCTALINK V 1 SPLINE - Experience seamless power transfer with Shimano’s 22mm hollow spindle design.

The Shimano 105 BB5500 bottom bracket features a 22mm Octalink V1 hollow spindle, a 68mm English-threaded shell, and a 109.5mm spindle length. Crafted from lightweight aluminum, it fits a wide range of Shimano cranksets, delivering reliable, smooth power transfer for serious cyclists.

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Brand	Shimano
Color	Silver
Material	Aluminum
Product Dimensions	4.31"L x 2.68"W
Item Weight	0.01 Ounces
Style	Modern
Thread Size	1.37
Manufacturer	Shimano
UPC	689228134522
Global Trade Identification Number	00689228134522
Item Package Dimensions L x W x H	5.31 x 1.93 x 1.69 inches
Package Weight	0.21 Kilograms
Item Dimensions LxWxH	1.75 x 2.25 x 6.5 inches
Brand Name	Shimano
Warranty Description	Limited Warranty
Model Name	EBB5500B09
Suggested Users	mens
Number of Items	1
Part Number	50-6860-068-1095
Included Components	Bottom Brackets
Size	68 x 109.5mm
Sport Type	Cycling

Shimano 105 BB5500 68x109.5mm English V1 Spline BB

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