Question 1

Is the valve core removable so a valve extension can be attached?

Accepted Answer

I just installed one, the only readily available tube that was close to fitting my ENVE 5.5 wheel, which needs an 80mm stem. The SmarTUBE has a 60mm stem. The valve cores are not removable, so if you need an extension to the stem, it will have to be a harder-to-find Cap or Synchronous external extension. 
Also, the stem is plastic and not threaded for a retainer nut, so if it is a  marginally usable length with your wheel, care must be taken that the stem doesn't get pushed down into the rim when adding air. 
This one worked for getting home, but will end up as a take along spare, and I will need to find either a removable core TPU tube, or one with an 80mm stem, or stick with butyl or latex tubes.

Question 2

can this be used on disc brakes?

Accepted Answer

This is just the tube that goes inside the tire. The brake type does not matter (rim vs disc). You can use it on either.

Question 3

Can't this be used  on a 23mm tire

Accepted Answer

This may sound counter intuitive but a wider tire would actually reduce your rolling resistance by 10% and using these tubes will help even more. Back on the tires 23 are good but using either 25-28 will be better because you can drop pressure from 124psi on a 23 down to 94psi on a 25 tire.

Question 4

How do you patch these tubes?

Accepted Answer

Pirelli (and Schwalbe) TPU tubes can be patched with the TPU-specific patch kit that Tubolito sells.  The glue takes 30 min to dry, so don't count on it for a quick roadside repair.  The patch is basically a little piece of the same material as the tube.  You also need to use an alcohol prep to clean the tube first, a few are included in the kit.
Park Tool says their testing showed that their glueless patches would stick to a Schwalbe Aerothan TPU tube.  That should hold for Pirelli or Tubolito as well, so I bought some to try but I have not needed to use them yet.

ASIN	B0975KB3ZB
Best Sellers Rank	#43,981 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #281 in Bike Tubes
Bike Type	Road Bike
Brand	Pirelli
Brand Name	Pirelli
Compatible Tire Width Maximum	32 Millimeters
Compatible Tire Width Minimum	23 Millimeters
Customer Reviews	3.7 out of 5 stars 453 Reviews
Global Trade Identification Number	08019227409437
Included Components	item
Item Diameter	70 Centimeters
Item Type Name	BICYCLE
Item Weight	35 Grams
Item Width	23 Millimeters
Manufacturer	Pirelli
Manufacturer Part Number	4094300
Material	Thermoplastic Rubber
Material Type	Thermoplastic Rubber
Model Number	336006001
Size	700 X 23-32mm
UPC	601479125722
Unit Count	1.0 Count
Valve Length	2.36 Inches
Valve Type	Presta
Warranty Description	Limited Warranty
Wheel Size	29 Inches

Pirelli P Zero SmarTUBE 23/32-622, Presta 60mm Valve - Ultimate Puncture Resistance, Low Weight, Road Bike Cycling Essentials - Bicycle Tire Tube

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