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@kubatyszko
Hi there, I have a Surly track cog, 21 teeth,
bought new at wiggle, used for 50km and went down to a 19.
Has a mark from the lockring and near the outer circumference from the lockring wrench.
Good for bike polo or low speed fixie riding - without any pressure on your knees or your back.
Paid 21GBP, will sell for 15 collected from SW1E (weekends or weekday evenings) or E14 (weekday work-hours). 16 shipped (paypal gift or moneybookers transfer).