Last year I had to replace two TG 1.75s due to sidewall failures. In both cases I had plenty of warning and was able to get home but hated having to throw away tyres with plenty of tread left. They'd both done around 3000 miles at the time. Earlier in the year I had put 90psi in the rear for a camping tour and also suspect I scuffed the tyres a bit on a rocky bridleway.
Since replacing them I've kept to tarmac and run the rear at 80psi, front at 70psi but have noticed a bit of cracking following the plys in the rear tyre. The official rating is 65 but apparently they're good for 90 so I don't think pressure is the problem and I've been careful not to scuff them. As this is the drive side rear I suppose it's possible chain oil has contaminated the casing but with mudguards and a hub gear I lose very little oil in the winter.
I like these tyres - they feel light, fast and comfortable, grip well in all weathers, cope OK with a bit of gravel, mud or snow and seem almost impossible to puncture. For my purposes they're ideal apart from this one fault!
I'm keeping an eye on the suspect tyre and hope it's just superficial but if it does develop into a problem I'd like to try something else. Any recommendations?
Looking at SJSCs online shop the Conti sport contact 1.6 looks like a contender. I've heard the Marathon 1.5 is good too but the smallest listed is the 1.75 and that seems a bit heavy.