Setting custom speed amounts for a job?

[Amphirax]

Title says all.
For example, I have a class named "Juggernaut" I want him to go maybe 70 below the max speed(I currently don't know it.)
TEAM_JUGGERNAUT = DarkRP.createJob("Juggernaut", {
    color = Color(8, 0, 177, 255),
    model = {"models/player/specnaz/slow_specnaz.mdl"},
    description = [[Juggernaut, Lol fucking buff guy!
RAID = YES(with warrant)
MUG = NO
STEAL = NO
BASE = NO]],
    weapons = {"m9k_m249lmg", "arrest_stick", "unarrest_stick", "stunstick", "weaponchecker", "door_ram", "m9k_mossberg590"},
    command = "jugger",
    max = 1,
    salary = 75,
    admin = 0,
    vote = true,
    hasLicense = true,
    candemote = true,
    category = "Police",
    PlayerSpawn = function(ply)
        ply:SetArmor(150)
    end,
    customCheck = function(ply) return CLIENT or
        table.HasValue({"owner", "superadmin", "smodv", "modv", "vipplus", "sitv", "hos", "adminv", "manager"}, ply:GetNWString("usergroup"))
    end,
    CustomCheckFailMsg = "This job is only for VIPPLUS!",
})
Currently my class right now.
Any help would be nice

Gamemode:DarkRP

[confuseth]

You can put
ply:SetRunSpeed(number)
ply:SetWalkSpeed(number)
inside your PlayerSpawn function, right below where you have ply:SetArmor(150)

[SneakySquid]

70% of 500 is 350. To get 70% of of a number you'd times it by 0.7.
100 * 0.7 -- 70
100 * 0.14 -- 14
100 * 0.08 -- 8