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Hi Johnnymac, I currently have an 110/90 18 inch Avon Roadrider on the rear of my Dominatrix. As the size isn't actually 110 I've just measured it and it's 4.5 inches (115mm) at it's widest point. This is very tight against the chainguard as it is so I'll probably swap it for a 100/90 when it's worn out to give a tad more clearance. As I've got a 100/90 18inch Roadrider on the front at the moment (another tight fit so it'll go on the back and get swapped for a 90/90 18) I've measured that and it's 4.05 inches (103mm) at it's widest point. I've no idea what a 120/90 18 would measure. Hope that helps.

[QUOTE="Mark Savage, post: 263929, member: 4953"] Hi Johnnymac, I currently have an 110/90 18 inch Avon Roadrider on the rear of my Dominatrix. As the size isn't [i]actually[/i] 110 I've just measured it and it's 4.5 inches (115mm) at it's widest point. This is very tight against the chainguard as it is so I'll probably swap it for a 100/90 when it's worn out to give a tad more clearance. As I've got a 100/90 18inch Roadrider on the front at the moment (another tight fit so it'll go on the back and get swapped for a 90/90 18) I've measured that and it's 4.05 inches (103mm) at it's widest point. I've no idea what a 120/90 18 would measure. Hope that helps. [/QUOTE]