There are a tonne of reasons why you’d want a flat bar road bike. Maybe it’s just something a bit different, maybe you don’t want drop bars, maybe it’s to make the bike feel more upright for about town, or maybe (like me) cos it looks sick. There are plenty of flat bar bikes on the market though; a great proportion of our guide to the best commuting bikes, and all of the best hybrid bikes are flat bar, but making your own brings something different to the table, especially if you use a road frame.
Converting a road bike, ‘cross bike, or tourer to flat bars is a relatively simple affair, though there are certain things that you need to consider, mainly in terms of making sure road and MTB components play nicely with each other. If you get it wrong with the shifting then the worst-case scenario is that you have bad shifting, which isn’t ideal but is rarely fatal. If you don’t get the brakes right then it’s far more serious, so pay attention.
This piece is purely the how, not the why. A love letter to why I think a flat bar road bike is great is coming soon.
The Bars
This is the simple bit – you’re going to need some flat bars. The thing to bear in mind is that the clamp diameter needs to match the stem. Most road bars and flat bars nowadays have a 31.8mm clamp diameter, but older bars can vary, with 25.4mm common, as well as 26mm.
Before you buy, cross-check things are going to match, and if you’re buying a new stem (you’ll need to match the fit, which I’ll go into at the bottom) then make sure they both match, as well as fitting the diameter of your steerer tube – usually either 1” or 1 ⅛”, the latter being the most common on modern bikes.
Shifting
Shimano Cable
If you’re coming at this like I did, with an old road bike frame running a cable-actuated groupset then this bit is extremely easy. Shimano makes Ultegra and 105 tier 11sp shifter levers as standalone parts for exactly this purpose. Get a set, slap them on the bars, attach the cables (that come included and already installed in the shifters), and you’re good to go.
If you’re rocking a new mechanical 12sp 105 groupset you’re out of…
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