Vertical dropouts hold the rear axle at a fixed distance from the cranks. Nine times out of ten this doesn't put the rear wheel at the right spot for a single speed drivetrain and the result is a chain that is too loose or too tight. The Melvin takes care of the chain tension and lets you run a single speed wheel on almost any frame with a derailleur hanger.
The Melvin uses two pulleys, just like a rear derailleur, which gives it 20 teeth of chain wrap. This means that the Melvin will work with multiple front chain rings while maintaining proper chain tension. Of course this is no longer a true single speed, but can come in handy when two or three gears is all you need. Twenty teeth of chain wrap means that chain rings with a maximum difference of twenty teeth can be used up front.
The mounting pivot has spacers that can be arranged to adjust the chainline. Chainline spacers allow it to work with most hubs. In addition to the pivot spacers, the pulleys have side to side float to quiet slight variances in chainline.
Pulleys are made of extruded and machined aluminium and have sealed bearings for durability. They are 2.25mm thick at the tooth which fits inside most narrow multi-speed chains, and the pulley cage is wide enough to allow 1/8" single speed chains as well.
• 6061 aluminum• 19-27mm chainline• largest rear cog max 20t• 76g
The correct shipping charges will be automatically calculated on your shopping basket. These shipping charges vary by order value and the delivery service chosen. If your country is not on the list please email us for a shipping quote.
If you order an item that is in stock before 2pm Monday-Friday, we will do our best to dispatch the goods on the same day. Please note, this might not be possible during busy periods, for example, immediately after Bank or Public Holidays. All orders are sent out for a Monday to Friday delivery.
For transit reasons all complete bikes are shipped 85% assembled. In order to make the bicycle road worthy a professional bike mechanic must check it and have all parts supplied assembled according to local regulations.
Please note that spray paint & other aerosol products can only be shipped to the following countries: United Kingdom (Including Isle of Man & Channel Islands), Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Ireland, Italy (mainland), Luxembourg, Netherlands, Poland, Portugal, Spain (mainland) and Sweden.
If you wish to cancel your order, please email us. Returned items must be in their original packaging and must be undamaged, unused and not trial fitted. Clothing must be unworn and unwashed with tags on if supplied. Shoes must be unworn with no dirt on the sole (or elsewhere) and must come with the original box.
For more details visit our shipping & returns page.
Can't quite afford your dream bike right now? Want to upgrade your ride, but prefer to spread the cost? We may be able to help. Depending on the value of your order and the number of instalments you can choose between V12 finance and Splitit.
Splitit is a global payment solution enabling shoppers to pay for purchases with an existing debit or credit card by splitting the cost up to six interest-free monthly payments. Splitit requires no application or registration and there is an instant approval by using the shoppers existing credit/debit card (Visa/Mastercard). You will not be charged interest and there are no hidden fees.
V12 finance is only available for UK residents. It allows you to split the costs of your purchase between 6, 10 or 12 instalments. You will have to fill the application form, but V12 finance process all application straight away, so you will get the decision in the matter of seconds. Just like with Split, V12 finance is interest free and there are no hidden fees.
Email us if you have any questions.