Can you mount this by using a door frame and closed door?

You can mount it anywhere there is enough support for it but it might be to low unless you are planning to use it for a child. You should make sure the door frame offers enough support. Also, make sure to use at least 5/16 thick eyehooks for it. I mounted them on my garage ceiling using a 4ft 2x4 for each ring to provide maximum support. The 2x4s were attached to 3 2x2 on the ceiling for each eyehook

How short can they get? Could you used them on a six foot power rack for ring dips?

You could shorten the straps for dips. The rings will get as short as you like. But you'd probably want to cut the excess...otherwise you'd have a lot of strap length to deal with.

I'm concerned the ring will be too large for my grip. What is the width?

Its about (guessing here) 1 and a half to 1 inch in width? Its not too large in my opinion and i have fairly small hands. Its definitely worth it. I've had it for about 4 months now.

Other rings advertise: Our straps are 18 feet long, with a functional range of 9 feet. Is 17' the length of functional range?

The rings I purchased have a 14' 4" strap, since the strap must be doubled to use the adjustable buckle (unless you come up with different fasteners), the adjustable length is about 7' max length to 9" min length. The min length is due to the buckle and double back sewn length which is too stiff to put over most supports. So, it's a 6' 3" adjustable length if these are still the same as when I purchased them. There's nothing to keep you from adding a quick link and extra webbing to increase the length. The adjustable length will be the same. Make sure to thread the buckle correctly, it's not obvious. I have been very satisfied with the rings.

ASIN	B0031QCS8C
Best Sellers Rank	#251,666 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #60 in Gymnastics Rings
Brand	ProsourceFit
Brand Name	ProsourceFit
Color	Black - Lexan
Customer Reviews	4.3 out of 5 stars 766 Reviews
Global Trade Identification Number	00853993002991
Included Components	Fitness Gymnastic Rings
Item Type Name	Fitness Gymnastic Rings
Item Weight	3.3 Pounds
Manufacturer	ProsourceFit
Material	Nylon
Maximum Weight Recommendation	1000 Pounds
Style	Fitness Gymnastic Rings
UPC	772259310901 787766660654 751738531266 853993002991
Unit Count	1.00 Count
Warranty Description	limited Lifetime Warranty

Fitness Gymnastics Rings with Straps for Total Body Conditioning at Home

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