How Sram And Shimano Are Looking To Perfect The 1x Chainline

Shimanos Ultegra line can be converted to 1x by replacing the chainrings with a single 1x chainring. Seems like only SRAM has a chainline of 49mm on their 1x11 cranks.

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A direct swipe at the dominance of Shimanos Ultegra Di2.

How sram and shimano are looking to perfect the 1x chainline. Recently published patents from SRAM and Shimano have unearthed two attempts to improve the chainline of todays 1x drivetrains. The rings are designed to be run in the big chainring position but the teeth actually sit a bit inboard of where an outer rings teeth would sit for better chainline. SRAM standard chainline is 49mm with 142mm OLD and thru axle.

Shimano makes a higher-end 11-42 thats perfectly compatible with the rest of SRAMs 1x drivetrain and it makes an 11-40 as well above right. Then you have your MTB chainline. Why inner tubes smell of fish.

Chainline is the distance between the centerline of your frame and the average centerline of your chainring s. 475 preferred but for frames with oversized seat tubes the longer dimension may be needed because the fat tube places the front derailer mechanism farther to the right. Shimano also offers the GRX RX810 111 groupset which is designed specifically for gravel use.

Here are the ranges for the most common cassettes that you might want to consider for 1x setups. You might ask why SRAM designed a dedicated 1x drivetrain around a 49-50mm chainline and the answer is very simple. The British website Cycling Industry News recently discovered patents from Shimano and SRAM which suggest the two leading component manufactures have been fast at work honing the virtues of 1X groupsets with the goal of creating drivetrains that are both quieter and more efficient.

It gets slightly more difficult if you have multiple front chainrings. Scroll down this pdf on the Shimano. The Force CX1 chainrings will come in five sizes from 38 to 46 teeth and future plans may include other sizes like a 36.

Singlespeed and Single-chainwheel MTB Boost 148 52 mm. How SRAM and Shimano are looking to perfect the 1x chainline. The rollout of that 50x42 is short about 31 gear inches.

Most bikes would only clear about a 28t chainring at a chainline that narrow and the most popular 1x sized chainring is a 32t with many riders wanting 34t and 36t options. Again this weight is without the bottom bracket. Initially designed for single-ring commuters the X-Sync chainrings are designed to play nice with SRAMs Eagle chain and drivetrain.

So a perfect 1x with minimal cross-chaining in the big cassette cogs is 46-47mm. Using patented X-Sync technology the Apex 1 crankset runs silent and secure. Riders looking for a wide gear range and shifting simplicity at a great value will find it in Apex 1.

Thats because the GRX front derailleur sits outboard further than Ultegra Dura-Ace etc. Race Face Next SL is 51mm. They feature more aggressive tooth profiles that almost hook the chain while evicting mud and grime in the process SRAM only offers it in SRAM.

Note that the 488 and 518 chainline is for the 2x11 cranks measured as average in between the two chainrings. Confirmed weight on our Scales Of Doom for a GX Eagle 112 drivetrain is 1766g while SLX M7100 comes in at 1882g. In order to pair with the wider chainline of the GRX crankset.

Most bikes would only clear about a 28t chainring at a chainline that narrow. 11-36327 range Shimano or SRAM 11-40364 range Shimano. People with shimano sometimes complain of the chain dropping when backpedalling but as far as I can see the answer to that is the same as the answer to all other 1x problems- buy SRAM.

Srams Force Rival and Apex road groupsets are all available in 1x versions. Both Shimano and Sram offer 1x compatible road options as well. SRAM makes an 11-42 in the Apex line kind of heavy kind of down-spec but its available.

The Apex 1 crankset completes the Apex 1 group SRAMs most affordable road 1x drivetrain yet. When SRAM first launched the long-awaited Force eTap AXS it brought the wireless electronic 12 speed shifting that SRAM Red AXS was known for but at a more affordable price-point. As with price grams are just as easy to quantify and here SRAM wins one back on Shimano.

You might ask why SRAM designed a dedicated 1x drivetrain around a 49-50mm chainline and the answer is very simple. For 1X this is easy If the center of your chainring teeth is 49mm from the centerline of your frame then your chainline is 49mm. While it was a great choice for 2x road setups it only went up to 11 shifting on both 2x and 1x setups.

We have chainrings to match most 1x drivetrain systems and chains including the newest 12-speed SRAM Eagle and Shimano Hyperglide. Additionally our Chainline And Material Optimization system or CAMO allows you to easily swap out front chainrings on direct mount cranks as well as achieve a perfect chainline. The 1x11 is just like the XTRs chainline 504mm measured in the middle of the outer chainring.

Shimano spec measured to the middle ring. And the newer 1x cranks like the new Force 1 basically line up with a MTB cassette position right out of the box with a 455mm chainline instead of.

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