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Discussion Starter · #1 ·
Hi guys. I'm quite confuse by different types of knobs used for different terrain.

Any example of tires that are used for different terrain? Such as dry, wet, mud.
Also i notice downhiller usually use one tire for most condition and only swap to a grippier one for extreme condition?
 

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Lots of closely spaced knobs tend to roll fast, but also tend to float on top of the terrain and gum up with mud more than a wider spacing.

Lots of little nobs tend to be better in dry loose conditions but can squirm more than large knobs that have more support and so are better on hard pack.
 

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Discussion Starter · #3 ·
So for loose terrain (soft sandy or gravel) do you use soft bigger knobs or small and closely spaced?
Also if the terrain is rooty and rocky but dry, is it still better to use soft bigger knobs?
 

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The looser the terrain the taller the knobs. The bigger the gravel the wider spacing between the knobs. In dry conditions hard compound is fine. Small knobs will tend to float over these conditions. People like a mountain king 2.4 in these conditions for example. A wide knob is more stable at speed that's why you will see downhill treads look like motorbike tires and don't vary much with terrain.

In sand, small knobs on a wide tire on the rear can work well as it will float over the surface and not dig in and bog you down. Poeple like a 2.3 small block eight in these conditions.

Small knobs with soft compound will work well on rooty and rocky conditions[especially wet] as they provide good surface area for grip. Avoid tall knobs on wet rocks and roots. Tall knobs will squirm in dry hard conditions but also flex to give you grip so will work on rocks but not feel as confident or secure as small knobs.
With loose rocks and you will be back to a bigger knob tire.
You can quite often get all of these conditions so it's a matter of balance and using the a tire that will best suit the variety of condtions you will encounter or one that will give you best confidence in the worst of the conditions you will encounter.

Ask people riding in your area can help.
 
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