Just wanted to point out that the last version removed ultimate belts compatibility, I wont use that mod, given that I have bob's belts so boosted, but they used to be compatible, and now they are not

https://mods.factorio.com/mod/UltimateBelts
Which speed they must have? Bob's mod adds basic (gray) belts and shift speed of yellow belt one tier higher.

yes, that could be tricky, in fact, last tier of bob's belt is now faster than las tier of ultimate, so its really not necesary, nevermind

But you can have twice higher speed too! Added to 0.2.1:

    {type = 'transport-belt', name = 'basic-transport-belt', tier = 1}, -- bob logistics

    {type = 'transport-belt', name = 'transport-belt', tier = 2}, -- vanilla
    {type = 'transport-belt', name = 'fast-transport-belt', tier = 3}, -- vanilla
    {type = 'transport-belt', name = 'express-transport-belt', tier = 4}, -- vanilla

    {type = 'transport-belt', name = 'turbo-transport-belt', tier = 5}, -- bob logistics
    {type = 'transport-belt', name = 'ultimate-transport-belt', tier = 6}, -- bob logistics

    {type = 'transport-belt', name = 'ultra-fast-belt', tier = 5}, -- UltimateBelts
    {type = 'transport-belt', name = 'extreme-fast-belt', tier = 6}, -- UltimateBelts
    {type = 'transport-belt', name = 'ultra-express-belt', tier = 7}, -- UltimateBelts
    {type = 'transport-belt', name = 'extreme-express-belt', tier = 8}, -- UltimateBelts
    {type = 'transport-belt', name = 'ultimate-belt', tier = 9}, -- UltimateBelts

oh, perfect