BT 020 200 - Too Wide?

[Zephyr41]

I initially decided to keep the 200 for just that reason but checking it after a longer ride today there was a shiny, sticky mark all around the tyre- the chain hits the tyre, after a while generating enough heat to melt the rubber and there's nothing I can do about it. The wheel is properly aligned and central- checked twice, very carefully! Double checked the chain alignment, condition and adjustment too, all OK.

To my surprise the shop agreed to swap it for a 190 so that's what I'll do.

Why it's too wide for my bike and obviously OK for others I don't know. New mould maybe? There's only a mm or 2 in it.

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