Upright Extensions + Calliper Upgrade Kit for use with Birzman Wheel Truing Stand (BM15-WHTS).
Upright extensions increase the hub compatibility up to 235mm.
New calliper design with interchangeable pointer bits allow greater rim compatibility range of 19-105mm.
Accepts tire widths up to 5".
SPHC / Aluminium / Alloy steel / High polymer (pointer)