Is this compatible with my current bb 'shimano dura-ace 9000 bottom bracket sm-bb9000'?

It should. I upgraded from 9000 to 9100 without any issues.

mine has alot of drag, what should I do??

Probably put too much torque on that plastic end cap on the non drive side. That is not really holding anything on it is just there to adjust tension on the crank/BB interface. Loosen the 5mm pinch bolts on the non-drive arm, back off the plastic nut/cap 1/2 a turn, give the cranks a little tap with a plastic mallet on each side to center them, then re-torque the 5mm pinch bolts. If you still have drag repeat process and back it off another 1/2 turn.

will this replace shimano UN55 68x122.5 ?

A un 55 is a square taper bottom bracket. The Dura ace is for cranks where the axel is mounted to the crank. If you have the correct version of the Shimano crank I assume it would fit. If you are going to use your existing crankset, then no.

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Shimano BB-R9100 Dura-Ace HollowTech II bearing cups - 68 mm English thread

Product ID: 68317908

Details

Bearing number
BB-R9100
Brand
SHIMANO
Item dimensions L x W x H
10 x 10 x 10
Item weight
113 g
Material
Other

🔄Advanced seal for ultra-smooth rotation

⚖️Lightweight 113 g design

⚙️68 mm English thread precision

€ 72.26

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Description

⚙️ Elevate your ride with precision and smoothness that only Shimano delivers!

TRUSTED LEGACY - From Shimano, a century of innovation powering your cycling ambitions.
SMOOTH OPERATOR - Advanced seal construction minimizes friction, delivering buttery-smooth pedal strokes every ride.
RIDE WITH CONFIDENCE - Backed by a 1-year manufacturer warranty and top-tier customer ratings (4.6/5).
FEATHERWEIGHT CHAMPION - At just 113 grams, this bottom bracket keeps your bike light and responsive.
PRECISION FIT MAXIMUM POWER - 68 mm English thread ensures seamless integration with your drivetrain for peak performance.

The Shimano BB-R9100 Dura-Ace HollowTech II bottom bracket features a 68 mm English thread and advanced seal construction for smoother rotation. Weighing just 113 grams, it offers a lightweight yet durable solution trusted by cyclists worldwide. Backed by Shimano’s century-long innovation and a 1-year warranty, it’s designed to seamlessly integrate with high-performance drivetrains, ensuring reliable and efficient power transfer.

Specifications

ASIN	B01ID3PO1U
Bearing Number	BB-R9100
Bearing Type	Ball Bearing
Best Sellers Rank	45,639 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 36 in Bottom Brackets for Bikes
Brand	SHIMANO
Compatible Lubricant	Oil or Grease
Customer Reviews	4.6 4.6 out of 5 stars (726)
EU Spare Part Availability Duration	2 Years
Global Trade Identification Number	04524667858614
Included Components	Bike Parts
Item Dimensions	10 x 10 x 10 millimetres
Item Type Name	Bike Parts
Item Weight	113 g
Manufacturer	Shimano
Manufacturer Part Number	IBBR9100B
Material	Other
Model Number	IBBR9100B
Number of Items	1
Number of Packs	1
Product Warranty	1 year manufacturer
UPC	689228858619
Unit Count	1 Count

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