e*thirteen is set to join the aftermarket cog business with the release of their Extended Range Cog, a nifty unit that can be subbed in to ten speed cassettes in order to increase gearing range. The EX Cog will be available in a few different flavours, with e*thirteen planning on offering both 40 and 42 tooth sizes for Shimano ten speed cassettes, and a single 42 tooth size that can be fitted to SRAM ten speed blocks. It's designed to replace either the 15 or 17 tooth stock cog, and is timed and ramped specific to Shimano and SRAM in order to have the shift aids line up correctly, meaning that you'll have to make sure to order the correct one when you pull the trigger. All of the EX Cogs also come from e*thirteen with a new B-tension screw that is longer than what you'll find used as stock on your derailleur, and it's only a matter of backing out the original screw and turning in the new one in order to provide enough clearance between the EX Cog and your derailleur's upper pulley. Colour choices include blue, black, and red, with all options retailing for $69.95 USD. e*thirteen says that they'll be shipping EX Cogs to shops by the middle of May.
A prototype version of e*thirteen's EX Cog that we spotted at this year's Taipei Bike Show. Production versions will be anodized as pictured above.
Why bother with swapping out the 15 or 17 tooth cog and subbing this pie plate gear in? ''It's for the guys who are okay with ten speed and don't want to spend $1,000 USD to go to eleven speed and get a 42 tooth cog,
'' says e*thirteen's Todd Bischoff.
And while e*thirteen isn't the first to the wide range add-on cog party, their reasoning certainly rings true - there are a load of ten speed drivetrains out there that work great but don't offer the gearing range that would allow a rider to easily turn over a single ring setup. Installing a 40 or 42 tooth cog allows many riders to chuck their front derailleur into the parts bin by picking an appropriate chain ring for their terrain, and all at a much more reasonable price than shelling out for a new drivetrain. Depending on your drivetrain components, there is also the option of running a double ring system with the EX Cog, a setup that should give you absolutely no excuses for walking up even the steepest of walls. Check out the compatibility chart below to see what will work for you.
Your local shop isn't the only place that you'll be seeing the EX Cog, with GT planning on shipping it with select Force platforms for 2015. That's a solid hint that GT has ditched the triple setups of 2014 in favour of a double ring, or maybe even single ring, cranksets. Interestingly, it won't come installed but rather as an option that the rider can fit if he or she wants to go that route, a strategy that should keep most everyone happy. ''GT will be including the e*thirteen EX Cog with select 2015 model bikes,
'' Todd Seplavy, GT's Director of Product told Pinkbike. ''This will allow riders to get into 1x drivetrains, offering the range of eleven speed at more accessible prices than currently available on the market.