| 21 X 4.50, Inner Tube, RUBBER STEMAdditional Information These bias ply, heavy duty tubes have a long rubber stem which replaces the original metal stem.
Fits either wood or wire wheels.
The rubber stem tubes end up costing a lot less in the long run since you don't have to purchase all of the additional hardware.
NOTE: Use with RIM FLAP, part# RF3 We also offer the two style original style metal stem tubes for the show cars. Part# MT3 with long stem for wood wheels and part# MT4 for wire wheels.
Intended for use on the following tire sizes: - 475/500-20
- 525/550-20
- 440/450-21
- 450/475-21
- 525/550-21
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