Originally Posted by nomadmax

Here's the short answer: No you can not close a gap of 16 mph AV to 21 mph AV with a better bike. Not even with the BEST bike will do that unless it has a mid drive electric motor. More fitness, more specifically, cycling fitness will help close that gap. There are some very knowledgeable people here regarding training methods. Have a look around for already posted material, no need to re-invent the wheel. If you're serious about going fast, get serious about your training, nutrition and rest. Then, when you've stepped thru that door and you need that last 1-2% buy a really nice bike. For now, with all the additional training it can't hurt to have a spare set of wheels but I wouldn't buy a new bike yet.