The trend today, for good reason, is to use wide rims, wider than “normal”. Wide rims allow one to use lower tyre pressures which in turn provides improved traction and comfort. Rolling resistance, contrary to popular belief, is also reduced because the wheel move up and down less, as the tyre absorbs the bumps.
However…..
Rim that are too wide for the tyre can square off the tyre too much, rendering the tyre’s side knobs, the ones that give you cornering grip, useless.
So how wide is optimal?
Here’s a quick guide on how wide your rims should be, based on the tyres you use:
- Tyres from 2.1 – 2.4″ wide work best on rims with an inner width between 24mm and 30mm.
- Tyres from 2.3 – 2.8″ wide work best with rims from 27mm to 36mm inner width.
What about weight?
Yes, wider rims and tyres do weigh more. If you’re looking for a stronger rim, go wider. If weight is important to you, go with the narrower end of the width spectrum.
For example, if you do marathon races or XCO, where weight is a priority, you’re probably using 2.1″ and 2.25″ tyres. In this case, a 25mm inner width rim is perfect.
If you’re a trail rider or do Enduro events, you’ll probably use 2.3 – 2.5″ tyres. In this case, get some 30mm inner width rims for the best strength to width to weight compromise.
But will it fit?
The last thing to consider if you’re thinking about new rims and tyres, is “will they fit my bike?”
My personal steel hardtail only has clearance for a 2.25″ rear tyre – anything wider touches the chainstay.
Simply put, forget the trends and get what will work best for you and your bike. Happy riding!
