It's hard to tell by how much Tien improved when he was resurrected and came back from Kaio-sama's training.
Android 17 knocked Tien out (pretty much) with a single blow, so Tien is weaker than 17, but so are (probably, not sure) Ichigo and Naruto.
Tien's speed seems to be at least relativistic , and since he took down a cultivar ('saibaman') who was supposedly similar in power/speed to Raditz, the bare minimum Tien should be capable of busting is whatever Raditz was capable of (island level ? maybe more, I'm not sure)
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