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The Kingpin Bushings sit tightly in position & hold the Kingpin in a wear-free position between the moving metal parts of the hanger & Baseplate. The Bushings allow the movement (steering) without wearing out the metal parts. The Kingpin bushings are a small item & are subjected to a lot of forces & stress, through regular use they will ultimately wear out & need replacing. Depending on what surface you are riding on & the nature of your riding style will depend on how long these bushings will last you.
To make sure your trucks are always performing at their best you should keep some spare on the shelf at home & inspect these tiny bushings regular basis (preferably before riding) & in particular replace any that are showing signs of wear & then even if they are not broken from time to time replace them anyway...
The difference between the four bushings is the thickness of the base. The different base sizes are 1mm, 1.5mm, 2mm and 2.5mm. 2.5mm is the standard size we work to. As all trucks have 4 bushings this .5mm difference in each of the bushing bases allows us to bridge a maximum distance of 2mm (4x.05mm=2m) resolving any foreseeable problems.
The Kingpin Bushings sit tightly in position & hold the Kingpin in a wear-free position between the moving metal parts of the hanger & Baseplate. The Bushings allow the movement (steering) without wearing out the metal parts. The Kingpin bushings are a small item & are subjected to a lot of forces & stress, through regular use they will ultimately wear out & need replacing. Depending on what surface you are riding on & the nature of your riding style will depend on how long these bushings will last you.
To make sure your trucks are always performing at their best you should keep some spare on the shelf at home & inspect these tiny bushings regular basis (preferably before riding) & in particular replace any that are showing signs of wear & then even if they are not broken from time to time replace them anyway...
The difference between the four bushings is the thickness of the base. The different base sizes are 1mm, 1.5mm, 2mm and 2.5mm. 2.5mm is the standard size we work to. As all trucks have 4 bushings this .5mm difference in each of the bushing bases allows us to bridge a maximum distance of 2mm (4x.05mm=2m) resolving any foreseeable problems.