Bigger tires - reuse tubes/flaps?

[area52]

When going from the 9.0 x 20 to the 11.00 x 20 tires can you reuse the tubes and flaps? or are they exclusive to each tire size? I know what the tubes are for, but what function do the flaps perform?

thanks

Wade

 

[rdixiemiller]

In years past, I have run 8.25 tubes in 900 tires, and 900 tubes in 1000's. I would at least use new tubes and flaps on the fronts.
The flap is to protect the tube from chafing on the wheel.

 

[gringeltaube]

Flaps can be reused if OK, they are the same size.