Tuesday 11 June 2019

Suntour NEX E25 - Review & Service

Suntour NEX E25 - Review & Service - Intro


 Suntour NEX E25 suspension forks are a suspension fork especially designed for use on e-bikes, presumably the 25kmh standard. I am not using these on an ebike. The forks are more heavily make to account perhaps for:

  • A heavier bike
  • a heavier rider
  • harder braking  
The forks have the following dimensions:

  • Tire Clearance - 54mm
  • Axle to Crown - 738mm
  • Stanchion size - 30mm 

Suntour NEX E25 - Updates

Update 2024. These have spent the last 3 years on a shelf, but recently I rebuilt them in to an ebike, and welded and extra length of steerer on to them to get up to about 400mm. I have also made so boots, to cover the exposed stations, and stop mud going on the silver bits. These boots used to be common pace on older forks but they got rid of them about 20 years ago because they don't look cool. 

Suntour NEX E25 - Review & Service - Use


The are suitable for "casual off road and paved road use".  I have used them off-road over very bumpy stuff, and I way 90kg / 15 stone.

I should note that prior to trying this fork, I was using the CR-8, a low end fork, even compared to this NEX E25 Fork which is worlds better.






These forks are slightly stiffer sprung, requiring less turns of the pre-load adjustment to make them good for riding. The lock out is a good feature.

Perhaps the most notable addition is damping, which stops the front of bike bouncing back up when you go over a hard bump.

I have ridden just 4 or 5 miles of off road on these forks, they do the job, thats all I can say.

The lock out is handy if you are stand up pedalling up a hill, but other then that I leave the forks unlocked.


Suntour NEX E25 - Review & Service - Guts


The specs from the suntour website give all manner of variations on these forks. In fact even afetr careful study I am not sure what model I have.

If you are not sure what you have best to head over the suntour website and look at the exploded views. Fairly sure this model below is what I have, but there are 4 other models some without lockout, and some with two coils.

Flood Risk Reports

Environmental Permit Applications 

Unlike the CR-8 this fork has damping which is a good feature to have! Even just for the 28" variants there are the follow models to wade through:

  •  SF17-NEX-E25-DS-15QLC32-700C-50,63-(2).pdf
  • SF17-NEX-E25-DS-HLO-15QLC32-700C-63-(2).pdf
  • SF17-NEX-E25-DS-LO-15QLC32-700C-50,63-(2).pdf
  • SF15-NEX-E25-DS-700-50,63-(1).pdf
  • SF15-NEX-E25-DS-HLO-700-50,63-(1).pdf
  • SF15-NEX-E25-DS-HLO-700C-63-CTS.pdf
  • SF14-NEX-E25-P-700-50,63-(2).pdf
  • SF14-NEX-E25-P-HLO-700-50,63-(1).pdf

Suntour NEX E25 - Review & Service - Conclusion

In conclusion these are a great set of forks, which I purchased for £30 from discount bikes de,  their retail price is about £70 at which point you could probably find any number of forks to choose from, of a similar or better specification.

Suntour NEX E25 - Service & Strip Down

After about 6 months, and not much ride time the travel on these forks became much reduced. This was most annoying, and so I took them apart, dried the insides and greased them up. They worked like new when I put them back together. So that is good to know! I will talk you through process below. 


1 - First off  you need to remove brake caliper from fork. I also had to remove dynamo cable. This is so you can slide the leg (green bits in this picture) off of the stanchions (silver bits).


2 - Then undo the nuts on the bottoms of the fork legs. Both nuts. 


2.1 - These nuts come off like this  . . . . 


1.1 - We already mentioned taking the brake caliper off!


3 - Then you give the legs a good hard pull (perhaps stand on handle bars) and they will come off. 

4 - Use a rag and a pokey thing (stick) to dry out and remove old grease from inside legs, wipe off all old grease from stanchions. Then re-grease everything and reassemble. Engaging the lock out switch will make it easier to get the left hand (in this picture) nut back on. 

Works a treat. Happy tinkering!


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