Is the monitor battery only, or can it be plugged in to wall?

The monitor uses a battery only.

I tried to change the seat, but the bolt(s) on the existing seat wouldn't budge with a wrench. Any tips, suggestions, warnings re changing the seat?

Use 2 wrenches on both nuts. One to hold & one to unscrew.

My magnet will no longer stay in place. how do i go about fixing this? it stays close to the wheel no matter how light i go with resistance.

I don’t know. I have no problems with this bike other than the seat being small and hard.

What is the lowest total height of the handlebars and device mount? I would like to place this underneath my standing desk.

41" inches. With the handlebars locked in in the lowest position, the measurement from the floor to the top edge of the device mount is 41". the handlebars are slightly lower than the top edge of the device mount.

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Sunny Health & Fitness Synergy Pro Magnetic Indoor Cycling Bike - SF-B1851

Product ID: 253369505

Details

Brand
Sunny Health &
Colour
black
Power source
Battery
Recommended uses for product
Indoor
Special features
Adjustable

⚙️40 lb flywheel for smooth momentum

❤️Built-in pulse sensors for real-time heart rate

🎚️Magnetic resistance for precise intensity control

Description

🚴‍♂️ Ride the future of fitness—where power meets precision!

HEART RATE HERO - Integrated pulse-sensing grips keep your cardio goals front and center with live feedback.
MOMENTUM MASTERY - 40-pound flywheel ensures ultra-smooth, consistent pedaling—ride like a pro every session.
RESISTANCE ROYALTY - Magnetic resistance lets you dial in your workout intensity with whisper-quiet precision.
DUAL ACTION TRAINING - Combine cycling with dumbbells to sculpt upper body and core while you burn calories.
ERGONOMIC EXCELLENCE - Adjustable seat and alloy steel frame deliver comfort and durability for every rider size.

The Sunny Health & Fitness Synergy Pro SF-B1851 indoor cycling bike features a heavy 40-pound flywheel for smooth momentum, magnetic resistance for customizable workouts, and built-in pulse sensors to monitor heart rate. Designed with an adjustable seat and durable alloy steel frame, it supports riders up to 136 kg and integrates upper body training options, making it a versatile, quiet, and professional-grade cardio machine.

Specifications

ASIN	B07Z45R1RT
Brand Name	Sunny Health & Fitness
Color	black
Customer Reviews	4.4 4.4 out of 5 stars (355)
Drive System	Belt
Global Trade Identification Number	00815749012432
Handle Material	Alloy Steel
Item Dimensions D x W x H	55.9D x 124.5W x 118.1H centimeters
Item Type Name	Synergy Pro Magnetic Indoor Cycling Bike
Item Weight	50 Kilograms
Manufacturer	Sunny Health & Fitness
Material	Alloy Steel
Maximum Height	84 Inches
Maximum Weight Recommendation	136.08 kg
Minimum Height	152.4 Centimeters
Model Name	SF-B1851
Model Number	SF-B1851
Part Number	SF-B1851
Power Source	Battery Powered
Recommended Uses For Product	Indoor
Resistance Mechanism	Magnetic
Special Features	Adjustable Seat
UPC	815749012432
Unit Count	1.00 Pack

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