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Effect of dropping BB with smaller wheel tire combo?

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Effect of dropping BB with smaller wheel tire combo?

Old 05-31-22, 05:18 AM
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Effect of dropping BB with smaller wheel tire combo?

Lets imagine that pedal strike is not an issue here.

What would a bike feel like if you could switch to a smaller wheelset that would drop the Bottom Bracket substantially?

am thinking of putting a 650B wheelset with 47mm tyres on my bike which has 700c wheels and 40 mm tyres. Will it feel more stable as I am lower to the ground? Is it nicer to be lower to the ground on a bike in general in a center of gravity sense?
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Old 05-31-22, 07:18 AM
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Indeed lower in terms of CoG will make your bike feel more stable. It may be too small to actually notice the difference but it's there nonetheless.

When I'm climbing very steep gradients ~20% I move forward on the seat and drop my upper body down low, in a time trial position. It moves the CoG forward and down, making it effortless to balance the bike even at low speeds so I can focus all my strength on my legs to climb instead of wasting some of that fighting to keep the bike from falling due to low speed. That position doesn't work for everyone however. Although it's more stable, some riders make more power when they're riding more upright than hunched down.

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Old 05-31-22, 09:42 AM
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I've never went to smaller wheels on a particular frame myself. But what I've read from others seems to indicate it might be more sporty and more maneuverable in their handling. And they reported that in a good overall feeling of enjoyment with the bike.

You'll be decreasing trail of the front wheel. So you lose some of the stuff that lets you ride no handed with more confidence.
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Old 05-31-22, 08:32 PM
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Originally Posted by Iride01
I've never went to smaller wheels on a particular frame myself. But what I've read from others seems to indicate it might be more sporty and more maneuverable in their handling. And they reported that in a good overall feeling of enjoyment with the bike.

You'll be decreasing trail of the front wheel. So you lose some of the stuff that lets you ride no handed with more confidence.
I used to do figure of 8's on the neighborhood street no handed on a bmx bike with 20" wheels back when I was around 12 years old. It's only a matter of what you're used to.

Indeed, the bike may seem more twitchy if you switch to smaller set wheels but that feeling should go away completely after a week of riding, same thing with shorter stems. Only fit matters the most. Everything else the mind and body can adapt to in no time.
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Old 06-01-22, 09:14 AM
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Originally Posted by jambon
Lets imagine that pedal strike is not an issue here.

What would a bike feel like if you could switch to a smaller wheelset that would drop the Bottom Bracket substantially?

am thinking of putting a 650B wheelset with 47mm tyres on my bike which has 700c wheels and 40 mm tyres. Will it feel more stable as I am lower to the ground? Is it nicer to be lower to the ground on a bike in general in a center of gravity sense?
We did that very thing when we bought my wife a new All-City Space Horse. Her size usually comes with 700x40C wheels, but I had it built up with 650x48B instead which lowered the bottom bracket and top tube and lessened the amount of toe overlap, without causing any pedal strike issues. She feels more "in the bike" than "on the bike", which is exactly what we were shooting for.
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