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edscoble
Issue with compass (I have Barlow Pass, same tread as bon jon but wider) is the compound is not grippy, I sled twice and you can 'feel' the lack of grip while riding .. they are light, they are fast but only in dry.
I went with Voyager hyper and they come in 39mm on 20mm internal rims. Really good tyre for the money (PX has them for £14.99 each atm). Grip is amazing in both dry and wet, I've already regained my riding/cornering confidence. The only downside is that they are heavier compared to extralite barlow pass. I am running them with latex inners because thats what I had with compass and I was too lazy to go in the shed to find a butyl inner.
Good rolling resistance test here: http://www.bicyclerollingresistance.com/tour-reviews/vittoria-voyager-hyper-2016