Will this spider for the Full E+ fit the Fathom E+3?

funnel

Member
May 15, 2020
69
26
World
Hi everybody,

Does anybody know if this spider for the Full E+ would fit the Fathom E+3? I'm thinking the internal gearing should be the same dimensions since they're both a Giant brand.
I'm considering doing this since using a spider would be easier to change the chainring and experiment with various brands/materials. I'm just in doubt about the depth of the part. I'm worried it could protrude too much out.



Thanks!

giant-direct-mount-kettenblatt-36-zaehne.jpg


giant-full-e-kettenblatt-spider.jpg
 

Pdoz

E*POWAH Elite World Champion
Feb 16, 2019
1,112
1,204
Maffra Victoria Australia
Not all giant ( yamaha) motors use the same crank attachments , so this is one of those cases where you need to remove yours and check.( or ask the shop?)

As an example , the 2017 full e had the old square axle whilst the 2018 full e pro the yamaha pwx motor so has modern splined axles that fit the spider you show.

Your bike has the "sport" motor , sorry but I don't know what axle that uses.
 

simonk

SLayer ?
Jan 27, 2020
337
423
Exeter
It’s all a bit confusing, but if you do have a SyncDrive Sport it looks like you need a special tool to remove the sprocket. See page 36 in the service manual...
DA29BACE-3B84-4211-8644-1757740FE6E6.jpeg


A friend of mine was in a similar situation to you with his Stance E (also SD Sport) recently and struggled to find any alternative options to the OEM Praxis part.
 

funnel

Member
May 15, 2020
69
26
World
Yes, I already sent an email to the seller if they can compare the parts. I also read the service manual and noticed I need the tool, but this is not a problem, I could manage.

I comapred the two parts in solidworks and both have 28 internal small teeths and that part seems ok, I'm just worri of how much it would protrude out and the chain be out of alignment or interfere with the crank.

chwh.PNG
 

funnel

Member
May 15, 2020
69
26
World
Just to update. I bought the Full E+ spider and put on a Shimano 36T chainring. I drove a little bit in front of the house in and it seems to work perfectly well.

There's a small difference in height between the two. The spider with the Shimano chainring is actually 3mm closer towards the frame compared to the stock that is more to the outside. But it seems it doesn't affect anything. It could just be the Shimano chainring is made like that. I need to buy some other brands to see if they align exactly as the stock one.
 

funnel

Member
May 15, 2020
69
26
World
Sure. I went for a longer ride today and I can confirm it works perfectly well. I took many pics so you can get a representative picture on how it looks when it's mounted.

I think in the future, next year or so, I'll mount a 40t(+) chainring and possibly a different cassette that goes from 11 to 40t. I still need to think about that, and probably a longer chain will be needed for this hack :)

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04fuxake

Active member
Feb 12, 2018
321
205
Porirua, NZ
Nice. Definitely something for me to consider on my Fathom.

Are you going to run a narrow-wide ring? I'd worry about the torque from the motor causing chain slip. It might also help your chainline issues you mentioned.

I'm running an 11-40T Zitto cassette on mine and it's fine. I had to adjust he B-screw a bit to clear the top pulley, but the chain length looks ok.
 
Last edited:

TheLob

Member
May 23, 2020
35
29
Northern Ireland
Is this the Shimano chainring you used ? I’m just about to fit the official Giant replacement (£45) but may do this modification in the future. IMG_0661.jpeg
 

funnel

Member
May 15, 2020
69
26
World
Is this the Shimano chainring you used ? I’m just about to fit the official Giant replacement (£45) but may do this modification in the future. View attachment 136519
Yeah, but I wouldn't recommend it since it's not a narrow-wide chainring and the chain falls off easily. At the time it was the only one I could find in the local shop. I later bought the narrow-wides online.
 

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