Sole trader - bike as a tax write-off?!?

So if I'm using the bike on a daily basis for meetings etc 5 days a week, and riding it 1-2 days over the weekend for fun, does claiming a 3rd of it still make sense?

my accountant advised me to claim a third of bike cost and a third of anything spent running/maintaing the bike... it's based on much of my week is freelance work (obviously a third) verses going to a PAYE job. This is much easier to work out.