Originally Posted by
ridingfool
Not sure of your budget but if your bike still has stock rims look to upgrade them . That should add a couple mph increase to your speed .also when u get another bike u can switch the rims. But in general keep at it and try to increase the miles by 10 percent each week and in about 20 weeks or less you should be able to reach 30 mph not mantaining that speed but hitting it and holding it for a min or 2 is a good start.
Holding 30mph for a minute or 2 is not easy at all. Do do that on a road bike unassisted (wind, gradient, drafting etc) requires you to be a lot better than the average cyclist.