Levo Gen 3 Gen 3 Conversion to SRAM T-Type

[IOUZIP]

I have read alot of old posts about this conversion but wanted to review it before I start ordering parts. This is for the Levo GEN 3 Full FAT. What I believe to be true:

• GX Eagle Transmission derailleur - Compatible
• 10-52T GX Eagle Transmission cassette - Compatible
• GX Transmission Flattop chain - Compatible

Where I get confused is the Chainring. I want to use the 104 bcd chainring. So my question is If the stock chainring is +3mm offset and the chainline is 52mm then would a 0mm offset make the chainline 55mm?

Email from Praxis the MTN E-RING 104BCD chainring is 0 offset.

 

[Ou812]

I have read alot of old posts about this conversion but wanted to review it before I start ordering parts. This is for the Levo GEN 3 Full FAT. What I believe to be true:

• GX Eagle Transmission derailleur - Compatible
• 10-52T GX Eagle Transmission cassette - Compatible
• GX Transmission Flattop chain - Compatible

Where I get confused is the Chainring. I want to use the 104 bcd chainring. So my question is If the stock chainring is +3mm offset and the chainline is 52mm then would a 0mm offset make the chainline 55mm?

I’ve been running the 104 chainring that came with the XO kit for months with no issues. The chainline is fine, you may have to play with micro tune a bit to get it perfect though. I haven’t had to re-adjust it since SRAM updated the torque figure for the mount bolt so that’s a plus.

The only other thing I recommend is don’t forget to buy the tools if you don’t already have them. I had to wait a few days for the right tools to show up before I could install mine, couldn’t get the damn chainring off the spider with it still on the bike at all.

 

[Mike O]

Perhaps this is helpful from the SRAM site? Pardon me if you've already seen this. It was not easy for me to find when I began researching why I was having trouble with the Brose kit installed by my LBS on my Gen 3. Using the XO kit installed solved my problems. Smooth as butter since.

What Eagle Transmission kit do I need for a Specialized Gen 3 Turbo Levo?

 

[Mikerb]

The Levo is a boost rear axle..ie 148mm therefore the chainline to match that is typically 52 or sometimes referred to as +3. My understanding is that T Type is normally specified with a 55 chainline (+5) but as a bove seems to work OK with 52 with a bit of fine tuning in the AXS app. The standard 104 BCD for the Levo is 0 offset presumably because the required (52 ) offset is provided by the spider.

ps chainline 49 is zero offset ( 49 is the distance from the centre of the BB to the chainring) and is typically to match with a 142/non boost rear hub.
Virtually every EMTB uses a boost rear hub ( 148) hence a chainring offset of 3 since the cassette is 3mm outboard compared to one mounted on a 142 hub.
If you stay with a 52 chainline the end result is that the chain is in line.....ie straight..... probably on cog 4 or 5 of a 12 speed cassette rather than cog 6. The chain will therefore be marginally more "crossed" on cogs 7 to 12 ( the highest gear ratios).

 

[IOUZIP]

0 offset is 49 not 55? I thought the +3 moved the chainring closer to the motor and 0 offset moved it closer to the crank arm. I run a 36t Praxis Ering chainring now. It just clears the frame.

 

[Mikerb]

0 offset is 49 not 55? I thought the +3 moved the chainring closer to the motor and 0 offset moved it closer to the crank arm. I run a 36t Praxis Ering chainring now. It just clears the frame.

Yes 49 is zero offset. As above the standard rear hub is 142mm but our bikes use a boost rear hub which is 148mm. The extra 6mm is equally extended on the drive and non drive side...so 3mm on the drive side. That pushes the cassette 3mm further out. A normal chainline lines up the chainwheel with the centre of the cassette. So to maintain that chainline when using a boost rear hub the chainring ( or combination of chainring and spider) is offset 3mm.....ie a 52mm chainline.
I do not know for sure but I suspect the reason for specifying a 55mm chainline for T type is that T Type does away with the mech hanger and the cassette is therefore positioned differently on the hub.

 

[IOUZIP]

With the Praxis 36t chainring it is crazy tight to the frame. I can't believe a chainring any closer to the frame is possible. I have ordered a SRAM Eagle T-Type Chainring - 36t, 12-Speed, 104 BCD, Steel, Black. I will see how it fits. All parts are ordered and expect them in next week. Thanks Everyone!

 

[randycpu]

That clearance looks scary

 

[losgatosgtr]

Let us know how everything goes