what is the difference between standard and oversized?

It refers to handle bar size. Standard is for 1" bars 25.4mm Oversize is the new bars that are 31.8mm in diameter.

Have a mark powers post on a terratrike rover that is 32mm diameter. will the oversized be able to work? can a slightly longer screw possibly work??

Dear valued Amazon Customer, The Oversized model works with the diameter of 27-35 mm. If you have additional questions about the Minoura Accessory Holder on Handlebar with LW-Clamp for Up 2 Devices- call us at 1-877-BIKEAID (245-3243) and we would be pleased to assist. Thanks and best!

Does the bar pivot separately from the clamp? In other words can I turn the bar 90 degrees?

Dear Thomas VanPay, Yes this bar would pivot separately from the clamp. If you have additional questions, feel free to call us at 1-877-BIKEAID (245-3243) and we would be pleased to assist you! Thanks and best.

Item Package Dimensions L x W x H	4.65 x 4.49 x 1.65 inches
Package Weight	0.18 Pounds
Item Dimensions LxWxH	7.75 x 5.5 x 2 inches
Brand Name	Minoura
Warranty Description	Limited Warranty
Model Name	339-3241-01
Color	Black
Number of Items	1
Manufacturer	Cycle Force Group
Part Number	339-3241-01
Model Year	2015
Included Components	Handlebar Accessory Mount
Size	Over Size

Minoura Accessory Holder on Handlebar with LW-Clamp for Up 2 Devices

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