Presenting: A first draft of the most common speed of all pokes that get a moderate amount of ou usage (ignoring choice scarf atm):

OU Speed Tiers (open)
OU Speed Tiers (close)

Code:

+ ------------ + ---- + ------ + --- + --- + ----- +
| [b]Pokemon[/b] | Base | Nature | Evs | Ivs | [b]Speed[/b] |
+ ------------ + ---- + ------ + --- + --- + ----- +
| [b]Deoxys-S[/b] | 180 | +Nat | 31 | 252 | [b]504[/b] |
| [b]Jolteon[/b] | 130 | +Nat | 31 | 252 | [b]394[/b] |
| [b]Alakazam[/b] | 120 | +Nat | 31 | 252 | [b]372[/b] |
| [b]Dugtrio[/b] | 120 | +Nat | 31 | 252 | [b]372[/b] |
| [b]Starmie[/b] | 115 | +Nat | 31 | 252 | [b]361[/b] |
| [b]Tornadus[/b] | 111 | +Nat | 31 | 252 | [b]353[/b] |
| [b]Latias[/b] | 110 | +Nat | 31 | 252 | [b]350[/b] |
| [b]Gengar[/b] | 110 | +Nat | 31 | 252 | [b]350[/b] |
| [b]Latios[/b] | 110 | +Nat | 31 | 252 | [b]350[/b] |
| [b]Espeon[/b] | 110 | +Nat | 31 | 252 | [b]350[/b] |
| [b]Infernape[/b] | 108 | +Nat | 31 | 252 | [b]346[/b] |
| [b]Terrakion[/b] | 108 | +Nat | 31 | 252 | [b]346[/b] |
| [b]Virizion[/b] | 108 | +Nat | 31 | 252 | [b]346[/b] |
| [b]Mienshao[/b] | 105 | +Nat | 31 | 252 | [b]339[/b] |
| [b]Landorus[/b] | 101 | +Nat | 31 | 252 | [b]331[/b] |
| [b]Salamence[/b] | 100 | +Nat | 31 | 252 | [b]328[/b] |
| [b]Ninetales[/b] | 100 | +Nat | 31 | 252 | [b]328[/b] |
| [b]Volcarona[/b] | 100 | Neut | 31 | 252 | [b]299[/b] |
| [b]Victini[/b] | 100 | Neut | 31 | 252 | [b]299[/b] |
| [b]Jirachi[/b] | 100 | Neut | 31 | 252 | [b]299[/b] |
| [b]Zapdos[/b] | 100 | Neut | 31 | 252 | [b]299[/b] |
| [b]Hydreigon[/b] | 98 | Neut | 31 | 252 | [b]295[/b] |
| [b]Haxorus[/b] | 97 | Neut | 31 | 252 | [b]293[/b] |
| [b]Darmanitan[/b] | 95 | Neut | 31 | 252 | [b]289[/b] |
| [b]Chandelure[/b] | 80 | +Nat | 31 | 252 | [b]284[/b] |
| [b]Lucario[/b] | 90 | Neut | 31 | 252 | [b]279[/b] |
| [b]Rotom-W[/b] | 86 | Neut | 31 | 252 | [b]271[/b] |
| [b]Toxicroak[/b] | 85 | Neut | 31 | 252 | [b]269[/b] |
| [b]Kingdra[/b] | 85 | Neut | 31 | 252 | [b]269[/b] |
| [b]Cloyster[/b] | 70 | +Nat | 31 | 252 | [b]262[/b] |
| [b]Gyarados[/b] | 81 | Neut | 31 | 252 | [b]261[/b] |
| [b]Venusaur[/b] | 80 | Neut | 31 | 252 | [b]259[/b] |
| [b]Mamoswine[/b] | 80 | Neut | 31 | 252 | [b]259[/b] |
| [b]Dragonite[/b] | 80 | Neut | 31 | 252 | [b]259[/b] |
| [b]Heatran[/b] | 77 | Neut | 31 | 252 | [b]253[/b] |
| [b]Mew[/b] | 100 | Neut | 31 | 44 | [b]247[/b] |
| [b]Celebi[/b] | 100 | Neut | 31 | 44 | [b]247[/b] |
| [b]Gliscor[/b] | 95 | Neut | 31 | 72 | [b]244[/b] |
| [b]Magnezone[/b] | 60 | +Nat | 31 | 252 | [b]240[/b] |
| [b]Breloom[/b] | 70 | Neut | 31 | 252 | [b]239[/b] |
| [b]Scrafty[/b] | 58 | +Nat | 31 | 252 | [b]236[/b] |
| [b]Tentacruel[/b] | 100 | Neut | 31 | 0 | [b]236[/b] |
| [b]Gorebyss[/b] | 52 | +Nat | 31 | 252 | [b]223[/b] |
| [b]Politoed[/b] | 70 | Neut | 31 | 0 | [b]176[/b] |
| [b]Metagross[/b] | 70 | Neut | 31 | 0 | [b]176[/b] |
| [b]Skarmory[/b] | 70 | Neut | 31 | 0 | [b]176[/b] |
| [b]Jellicent[/b] | 60 | Neut | 31 | 44 | [b]167[/b] |
| [b]Vaporeon[/b] | 65 | Neut | 31 | 0 | [b]166[/b] |
| [b]Scizor[/b] | 65 | Neut | 31 | 0 | [b]166[/b] |
| [b]Porygon2[/b] | 60 | Neut | 31 | 0 | [b]156[/b] |
| [b]Abomasnow[/b] | 60 | Neut | 31 | 0 | [b]156[/b] |
| [b]Machamp[/b] | 55 | Neut | 31 | 0 | [b]146[/b] |
| [b]Blissey[/b] | 55 | Neut | 31 | 0 | [b]146[/b] |
| [b]Chansey[/b] | 50 | Neut | 31 | 0 | [b]136[/b] |
| [b]Donphan[/b] | 50 | Neut | 31 | 0 | [b]136[/b] |
| [b]Sableye[/b] | 50 | Neut | 31 | 0 | [b]136[/b] |
| [b]Hippowdon[/b] | 47 | Neut | 31 | 0 | [b]130[/b] |
| [b]Conkeldurr[/b] | 45 | Neut | 31 | 0 | [b]126[/b] |
| [b]Gastrodon[/b] | 39 | Neut | 31 | 0 | [b]114[/b] |
| [b]Tyranitar[/b] | 61 | -Nat | 0 | 0 | [b]114[/b] |
| [b]Swampert[/b] | 60 | -Nat | 0 | 0 | [b]112[/b] |
| [b]Slowbro[/b] | 30 | Neut | 31 | 0 | [b]96[/b] |
| [b]Forretress[/b] | 40 | -Nat | 0 | 0 | [b]76[/b] |
| [b]Quagsire[/b] | 35 | -Nat | 0 | 0 | [b]67[/b] |
| [b]Bronzong[/b] | 33 | -Nat | 0 | 0 | [b]63[/b] |
| [b]Reuniclus[/b] | 30 | -Nat | 0 | 0 | [b]58[/b] |
| [b]Ferrothorn[/b] | 20 | -Nat | 0 | 0 | [b]40[/b] |
+ ------------ + ---- + ------ + --- + --- + ----- +

Tell me if there appear to be any glaring errors.