RampCrab Axle Widening Upgrade Parts for TRX4M, 5mm Width on Both Sides (Front & Rear) Brass Upgrade Parts for TRX4m RC Crawler Car, 1/18 TRX4-M Unlimited Trail Buggy Ultra 5

The RampCrab Expansion Upgrade Kit (Ultra 5) for TRX4M allows you to widen your TRX4m RC car axles by 5mm on each side than stock, resulting in an increase of 10mm in overall width For front and rear axles Easy to install and improve stability