We're living pretty frugal right now, and the $700 we paid for a used Burley back in March was a major expenditure. Anything to keep it on the road is not discretionary spending, it is legitimate expense. We were considering some rather lavish upgrades, but since I ended up replacing a lot of wear items the impetus is just not there at the moment.
I voted no impact since the economic downturn has little to do with the decision to forgo or delay significant upgrades, and we'll spend on wear items or upgrades as parts fail pretty much regardless of the economy.