I visited a bicycle shop a few days ago. I noticed two different types of bikes. One with thick front suspension and the other with thin front suspension. Bike with the thick suspension was more expensive.
Does thick suspension provide benefits or just add weight?
Is thin suspension more better than thick one?

Thick Suspension:

thick suspension

Thin Suspension:

thin suspension

Full Images:

Full image Full image 2

  • 3
    OMG those 'mudguards'! Mar 1, 2019 at 19:35
  • 2
    And the first one is "dual-crown"! Mar 1, 2019 at 20:11
  • 3
    @BlackThunder I'd say both are equally crappy. Get whatever looks better for you and don't expect much from it. Mar 2, 2019 at 4:34
  • 4
    @BlackThunder Cheap does not always mean crappy, but in this case, it unfortunately is. For mountain biking, both of these bikes are equally incapable and, let me be honest, dangerous. It might not be seen at the front suspension, but look at the rear "shock": it's just a spring in both cases! no oil camera, no nothing. It will bounce uncontrollably trying to throw a rider forward. You'd be better off with a hardtail. For road riding (e.g. commuting), both of these bikes weigh excessively and have too many components to maintain. Again, a full rigid bike at the same price will be better. Mar 2, 2019 at 6:32
  • 2
    The first one has radially laced wheels and disk brakes. If the brakes work at all, the wheels will self destruct when you use them.
    – ojs
    Mar 2, 2019 at 9:15

2 Answers 2


Fork-leg diameter is not really how you would classify suspension forks. Or more exactly, it is a way, but not really the most relevant.

Suspension forks could be classified by how much travel they provide (different travel for different specific uses), the suspension mechanism (springs, fluid, elastomers, air, hybrid), the damping mechanism, etc.

I suspect that both those bikes were pretty cheap, both probably use spring suspension, and neither is really intended for hard off-road use. A bigger-diameter tube isn't necessarily heavier, as it can be made with thinner walls.


Well they do are a little bit sturdier. Bigger diametre is harder to bend than a thin one and should requiere less material. Other thing is that the one on the red bike is a double crown, which has the benefit of being sturdier on force loads from the front of the bike.

But the most important aspect is the quality of the materials used. For example in my early days(circa 2000) I bought this "ZOOM 110 Inverted fork 20mm axle suspension with 40mm bars" which was a double crown and made out of aluminium. Thing was massive I felt like Josh Bender.

After a couple drops(like 4) the thing bent forwards and was stuck, dad wanted to kill me. My old RST sigma xl on the other hand, was WAY better with 28mm steel bars, 14mm axle and was a standard fork, thing was bomb proof for the time. This one lasted a long time.

So the most important aspect is the design and materials used. In this case both are about the same, probably the double crown is a little bit sturdier, but both are just an entry level fork and for lesiure rides you will be better of with the single crown fork. It should have the same ride quality with less weight.

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