Sisakkal biztonságosabb, de nedves úton könnyű megcsúszni.

Because Hungarian uses the suffix -val / -vel to mean with.

So:

• sisak = helmet
• sisakkal = with a helmet

Here, -val changes its sound to match the final consonant of the noun. Since sisak ends in k, the v assimilates, and the result is sisakkal.

This is a common pattern:

• bot
  • -val → bottal
• kéz
  • -vel → kézzel

So sisakkal is the normal, correct form.

Because Hungarian often leaves out the article in general statements.

Sisakkal biztonságosabb means something like With a helmet, it is safer or It’s safer wearing a helmet. It is talking about helmets in a general sense, not about one specific helmet.

If you wanted to refer to a specific helmet, you could use an article, for example:

• A sisakkal biztonságosabb. = It is safer with the helmet.

But in this sentence, the idea is general, so no article is needed.

In Hungarian, the verb to be is usually omitted in the present tense, third person.

So where English says:

• It is safer

Hungarian often simply says:

• Biztonságosabb

The meaning of is is understood automatically.

This is very normal:

• Ő magas. = He is tall.
• Ez drága. = This is expensive.
• Sisakkal biztonságosabb. = It is safer with a helmet.

The ending -bb forms the comparative, like English -er or more.

So:

• biztonságos = safe
• biztonságosabb = safer

This works with many adjectives:

• gyors = fast → gyorsabb = faster
• olcsó = cheap → olcsóbb = cheaper

So biztonságosabb simply means safer.

Hungarian, like English, does not always have to state the second half of a comparison if it is obvious from context.

So Sisakkal biztonságosabb means:

• It is safer with a helmet
• understood: than without one

If you wanted to say it explicitly, Hungarian could use mint:

• Sisakkal biztonságosabb, mint anélkül.
• It is safer with a helmet than without one.

But in everyday speech, leaving that unstated is very natural.

Úton is the noun út with the superessive ending -on / -en / -ön, which often means on.

So:

• út = road
• úton = on the road / on a road

In this sentence, nedves úton means on a wet road or more naturally on wet roads / on a wet road surface.

This case is very common with surfaces:

• asztalon = on the table
• padlón = on the floor
• úton = on the road

Because in Hungarian, adjectives usually do not agree with the noun in case or number when they directly modify it.

So:

• nedves út = wet road
• nedves úton = on a wet road

Only the noun gets the case ending here, not the adjective.

This is different from some other languages, but it is normal Hungarian structure:

• piros autó = red car
• piros autóval = with a red car

Not pirossal autóval in that kind of structure.

This is a very common Hungarian pattern:

• könnyű + infinitive = it is easy to ...
• nehéz + infinitive = it is difficult to ...

So:

• könnyű megcsúszni = it is easy to slip / skid

Hungarian often uses this impersonal structure instead of adding a subject like it.

Other examples:

• Könnyű eltévedni. = It is easy to get lost.
• Nehéz ezt megérteni. = It is hard to understand this.

Csúszni means to slide. With the prefix meg-, megcsúszni usually means to slip, to skid, or to lose traction.

In the context of a wet road, megcsúszni strongly suggests losing grip, especially while walking, cycling, or driving.

So here it means something like:

• to slip
• to skid
• to slide unexpectedly

The prefix meg- often gives the verb a more completed or event-like feel.

It is usually understood generically here.

So nedves úton könnyű megcsúszni means:

• It is easy to slip on a wet road
• or more naturally in English, It is easy to slip on wet roads

Hungarian often uses the singular in this kind of general statement, where English may also choose singular or plural depending on style.

The word order is natural because Hungarian often puts the most important setting or circumstance early in the clause.

So:

• Sisakkal sets the condition: with a helmet
• nedves úton sets the situation: on a wet road

Then the main comment comes after that:

• biztonságosabb = safer
• könnyű megcsúszni = it is easy to slip

A very literal breakdown is:

• With a helmet, safer
• but on a wet road, easy to slip

This sounds incomplete in English, but in Hungarian it is perfectly normal.

Because de means but, and it joins two clauses.

Hungarian normally uses a comma before coordinating conjunctions like de when they connect clauses:

• Sisakkal biztonságosabb, de nedves úton könnyű megcsúszni.

This is similar to English punctuation in many cases:

• It is safer with a helmet, but it is easy to slip on a wet road.

So the comma is standard and expected here.