will this work with a .75" ball?

No. In my opinion this would not close enough to be tight. It's rated for 1" and anything less looks unlikely given its' build tolerance.

Is this too bulky for a motorbike? All the customer images show this inside a car ... anyone have this on the bike handlebar?

Yes, you can use it on a bike. I have used it on a Harley Electraglide, a BMW K1300s, and a BMW R1200GS Adv. Works fine. But see my review. I think it is more bulky and complicated than it needs to be. You can achieve the same with simpler RAM options. But yes, you CAN use it on a bike.

Will it work with a 16mm ball

The description reads that it's for 1 inch balls, so I don't believe it would work at all with 16mm balls.

Can I easily rotate it from vertical to horizontal without loosening anything?

No, the rubber-coated RAM balls are designed not to slip. In order to rotate any ball or the central pivot, the corresponding wingnut must be loosened first.

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Ram Mount RAP-B-200-2U Composite Double Socket Swivel and Ratchet Arm, 159mm Diameter, Black

Ram Mount RAP-B-200-2U Composite Double Socket Swivel and Ratchet Arm, 159mm Diameter, Black

Product ID: 274360446

Details

Brand
RAM MOUNTS
Colour
Black
Compatible devices
Mobile Phone
Compatible phone models
1
Mounting type
Handlebar

🔄360° swivel & ratchet adjustability

🖤durable black composite build

⚙️159mm precision arm length

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€ 85.48

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In stock

Sold byAmazon SpainDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Elevate your gear game with precision and style!

PRECISION 159 MM ARM LENGTH - Optimized reach for perfect device positioning every time
360 SWIVEL RATCHET ACTION - Effortlessly adjust your device angle with smooth, secure locking
LIGHTWEIGHT YET ROBUST COMPOSITE - Strong enough to hold up to 2 lbs without adding bulk
UNIVERSAL B SIZE BALL COMPATIBILITY - Seamlessly attaches to any B-size Ram ball for ultimate modularity
VERSATILE MOUNTING FOR ALL YOUR DEVICES - Supports phones, tablets, cameras, and more across vehicles and gear

The Ram Mount RAP-B-200-2U is a 159mm composite double socket swivel and ratchet arm designed for professional-grade mounting solutions. Compatible with all B-size Ram ball components, it offers 360° adjustability and a durable yet lightweight build, supporting devices up to 2 pounds. Perfect for mobile phones, tablets, cameras, and more, it’s the go-to choice for seamless, secure mounting across vehicles and equipment.

Specifications

ASIN	B009SX0J88
Additional Features	Rotatable
Best Sellers Rank	#61,804 in Electronics ( See Top 100 in Electronics ) #40 in Photographic Lighting Mounting Hardware
Brand	RAM MOUNTS
Color	Black
Compatible Devices	Mobile Phone, Tablet, Camera, Speakers, Projector, Smart Speakers, Headphones
Compatible Phone Models	1
Compatible with Vehicle Type	Automobile, Motorcycle, Bicycle, Truck, ATV, Golf Cart
Customer Reviews	4.6 4.6 out of 5 stars (2,413)
Enclosure Material	Plastic
Global Trade Identification Number	00793442938771
Item Dimensions	22.9 x 7.6 x 2.5 centimeters
Item Weight	181 g
Manufacturer	RAM Mount
Mfr Part Number	RAPB2002U
Model Name	RAP-B-200-2U
Model Number	RAPB2002U
Mounting Type	Handlebar
Shape	Rectangular
UPC	886172052913 190283707588 793442938771 793442936982
Water Resistance Level	Not Water Resistant
Weight Capacity Maximum	2 Pounds

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