Conversions... what's the problem?

As Dan says, a major problem is that the bottom bracket is too low, add to this the short cranks and you have a recipe for serious ligament, muscle and knee joint problems as you inevitably spedn a lot time grinding - pedalling far too slowly. 90 -110 per minute and NO slow turning starts. I will be dead by the time all the fixed/singlespeed trendies are costing everyone a fortune in NHS payments but my kids will have to pay. So just don't do it.

Because, let's face it, it is a trend and in a few years, fgss will have died out a lot and people will be collecting Sturmey Archer or something...