I bought the Con-Tec DL-120 for the left one month in bicycle shop and am totally disappointed with the thing. The wheel from the Dynamo, which is applied to the tire has come off in no time and can not be re-bolted firmly. The thread is designed so that it is in the direction of unscrewing. The much more favorable Baumarkt-Dynamo, which I had previously held over 10 years and this less than a month. With such a safety-related component which is an absolutely unacceptable behavior, which the manufacturer of this product expects of the customer. From this manufacturer I will never buy anything again!