Once you have calculated how much factory capacity you require, if your production requirements exceed the available capacity of your factory you can increase this through the Manufacturing Screen.
To increase your factory capacity you will need to enter your required workforce and SCU level in the Hire Workers and Purchase SCU decision fields.
More workers can be hired almost instantaneously but a change in plant size takes a year before it is completed, so you will need to plan your plant size changes a year in advance.
SCU can be purchased in multiples of 10 SCU, every 10 SCU of plant costs $1,600 to buy.
Too much capacity relative to production/sales demand will result in greater idle time (inefficient use of resources causing higher average manufacturing costs per bike) and will have a negative effect on your SHV.