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not sure but i think any 19mm US sized BB will do
Measure first `cos I fitted a new bb to a bike last week and the Prolines (from 1999) had a 20mm spindle.Other (later)Prolines I`ve owned were 19mm.
Thanks guys, I'll have a measure up before I do anything. Are both 19mm and 20mm versions easy enough to get hold of or is one scarce (the one I will need...)