Dual ring guides are one of the more complicated guidance systems, so we will need to narrow down a few options to see what will work best for your bike

When picking a guide, you will need to know a few things

Which guide features suit your riding style and bike best (see steps 2-3)

How the guide will be fixed to your bike (See step 4-7)

If your cranks will work within the specified chainline of the guide (see step 7-9)

Front derailleur compatibility (See step 10-12)

There are two bash protection options for the TRS dual guide and one option without bash protection

The DMB/direct mount bash version and the no bash/Turbocharger version

The Direct mount bash (DMB) version has a bash guard mounted directly to the backplate of the guide and is perfect for double specific cranks that do not allow for a ring mounted bashguard in the big ring position

This is because there is no big ring position on a double specific crank

The no bash/Turbocharger version comes with two lower sliders in the box

One that allows you to run the guide without a bashguard

And one that allows you to use a ring mounted bash guard (sold separately) in the big ring position if your cranks allow it

Our bashring is called the Turbocharger, hence the name

Having a bash in the big ring position also gives you over-shift protection, giving you 100% chain security

As far as mounting the guide to a frame, there are four options

BB

BBwide

ISCGold

ISCG05

ISCG05 and ISCGold fit the two different ISCG standards

ISCG spacers are used to adjust the chain line of the guide to match your cranks

You can read more about the two ISCG standards here: ISCG explained

For bikes without ISCG tabs the guide may be mounted under the bottom bracket

You must have a threaded bottom bracket to mount the guide to the BB shell

Frames with press-fit BB shells and no ISCG tabs do not provide any mounting for a chainguide, sorry but there is simply no place for us to reliably mount a guide

We offer two different BB mount backplate

BB

BBwide

The BB and BBwide backplates differ in their chainline

Chainline can be checked by measuring from the center of the frame, to the center of the big ring

For more info see Chainline explained

BB mount is for a traditional or standard double crank with a chainline of 50-51mm

Standard doubles are essentially converted triple cranks missing the big ring, sometimes a bash is used in the big ring position

All e*thirteen cranks are standard doubles

BBwide is for double specific cranks as those cranks use a wider chainline

Wide doubles are double specific and typically have a chainline of 53-53.5mm to the middle of the outer ring

Wide doubles have no bash mounting position (both Sram and Shimano now offer these cranks)

Front derailleur function is vital to the performance of dual ring guides. An improperly used front derailleur will cause the guide to function poorly.

Be sure to choose a derailleur that is designed to work with your chosen chainring sizes.

Guides not using a Turbocharger bash ring must be used with a double specific front derailleur

Check with your derailleur manufacturer to make sure your derailleur is 2x specific

If your frame uses a direct mount front derailleur you must use the direct mount derailleur that matches your large chainring size. Direct mount front derailleurs are chainring specific.

For guides using a bashring in place of the big ring, a triple front derailleur should be used.

Check with your derailleur manufacturer to make sure you have the correct front derailleur.