This is a modified version of the included wheels from Tamiya TAMIYA 15534 Mini 4WD Grade Up Parts No.534 Low Friction Small Diameter Low Height Tires (26mm) & Carbon Reinforced Wheels (Fin). The tire mounting area is untouched, only the inner fins have been modified, so unmodified tires can still be used. Additional processing options are available: Rim height adjustment Width reduction Centering (processed while mounted on a shaft) 1 type + 300 yen 2 types + 500 yen 3 types + 500 yen Selection (4 wheels) + 3000 yen Selection will require some lead time due to inventory. When centering, some minor runout may occur even after selection. Selected wheels will be processed to minimize vertical and horizontal runout. Please confirm the price and lead time in the comments. The included low friction tires can also be modified. Can be processed from 22mm and up, in 0.1mm increments. The values are the dimensions when mounted on unmodified carbon wheels. Please understand that there may be slight measurement errors due to differences in inspection tools. 1 set of 4 tires is 1000 yen. +70 yen for Mercari shipping. Please ask if you would like this option.