Decathlon Rockrider E-ST900

[BeBiker]

anyone installed a dropper seatpost? looking to get one, but no idea where to start

Yes I did, all pics and info are in this tread:

Rockrider E-st 900 changes upgrades

I am very satisfied with my new Decathlon Rockrider e-st 900, but like everything, nothing is perfect. In this tread I will document all changes I make to the Ebike. I use it daily for Field roads, asphalt Work commute, twice a week for bushes or bike parks. You will also see some "missing...

www.emtbforums.com

 

[E-MAD MALC]

Took it back, got a brand new motor, thumbs up for Decathlon Ondrara.

anyone installed a dropper seatpost? looking to get one, but no idea where to start

I also installed a dropper with 40mm suspension
Great bit of kit

COAST SUSPENSION DROPPER POST

Suspension + Drop. The Coast Post combines the benefits of a dropper with the joint saving squish of suspension. This witchcraft all happens via a dual chamber hydraulic cartridge featuring 40mm of tunable air suspension, designed to help riders on all types of bikes - from packed up trekkers...

www.pnwcomponents.co.uk

 

[pmburton]

I've seen a few photos here of front mudguards on this bike. How/where do you attach them? The strut between the two suspension tubes which would be the obvious place to mount it, has no mounting holes. I'm very wary to drill holes in there in order to bolt on a mudguard incase it structually weakens a part which I imagine has quite a lot of load placed on it.

 

[RonnieX]

I've seen a few photos here of front mudguards on this bike. How/where do you attach them? The strut between the two suspension tubes which would be the obvious place to mount it, has no mounting holes. I'm very wary to drill holes in there in order to bolt on a mudguard incase it structually weakens a part which I imagine has quite a lot of load placed on it.

All the ones shown are usually attached with rubber bands hooked around the forks.

 

[BeBiker]

I've seen a few photos here of front mudguards on this bike. How/where do you attach them? The strut between the two suspension tubes which would be the obvious place to mount it, has no mounting holes. I'm very wary to drill holes in there in order to bolt on a mudguard incase it structually weakens a part which I imagine has quite a lot of load placed on it.

I drilled the hole, cut a m6 tread, and mounted the mudguard.

2 years after, it is proven that there was no structurally weakening, the structurally weakening didn't affect the safety margin, or the structurally weakening was not relevant to the applied load.

 

[Porridge86]

I've got a Mudhugger on the front of mine. Attaches with just black cable ties.

It was originally on my ancient 2012 GT Avalanche. When I got it was the only front guard Mudhugger did so not sure of the equivalent one today. But definitely recommend them.

I also have the standard rear one as well. This also attaches with just cable ties.

Both fit over the stock tyres just fine.

 

[silles]

does anyone know if the front wheel bearing are servicable or not? They seem to have a bit of a play now, but couldnt figure out how to take them apart.

 

[silles]

actually got to the bearing, pulled off the black caps/cones. they seem fine. filled up with grease ... however the when I tighten it up in the fork there is still a play. No idea why.

 

[c412lj]

Hi, Just a quick hello. just joined site for tips and advice on 1st ebike. girlfriend moved close to some lovely trails so she we decided to take the plunge and get ebikes. for me itll be commuting to work and steady trails.
purchased est 900 and it got delivered yesterday. set up was simple, connected to brose app on phone simple, took it out for a spin and loving my 1st ebike.
After reading advice here the sec i got home after a bedding in run i knew i needed a 38t as i pretty much never left 11 cog all journey. ordered, delived and fitted already tried brute force approach from @BeBiker and quickly moved onto the hacksaw approach. simple mod all running perfect.
tyres are huge and not what im used to but i think im just gonna run them to death then come down to a 2.4 as alot of ppl seem to have done. whether i go tubeless is another story as i have zero experience with that.
cheers for all the advice ive picked up so far
Carl

 

[BeBiker]

The hacksaw approach is indeed the way to go.
Thanks to the slight force approach I still have the undamaged original chainring, useless forever in a box.

 

[McOlly101]

Mine is definitely the rear brake rotor connecting with the pads, despite tightened to 20nm.

If you grab the rear wheel and move it with one hand from side to side. You can see the rotor move side to side in the brake calliper. There simply isn’t enough torque!

9 months old and 1850 miles covered, but still does it!

Hello, first post here as I’m in new to EMTBs. Just recently brought an E-ST 900 and I also have that noise. Seems to be above 20kph and cornering mostly but can just be whilst pedalling along with my weight on the bike. I’ve been told to ride for 50 or so miles to run in the brakes but it’s getting close to that distance and it’s still making the metallic clanging sound. Did yours ever resolve its self or is it a case of trying to get a replacement rear wheel or entire bike from decathlon?

 

[RonnieX]

No. It was never resolved. I'm just used to it now. I've even had a new back wheel under warranty but it didn't sort it!

 

[McOlly101]

No. It was never resolved. I'm just used to it now. I've even had a new back wheel under warranty but it didn't sort it!

Ok thanks, I’ll go back to them and see what they can offer.

 

[DT36]

Mines had a metalic noise for over 2 years. I just ignore it now

 

[McOlly101]

Mines had a metalic noise for over 2 years. I just ignore it now

Yes I’m sure I’d get used to it but I’m going to go back as it’s only a week old and see what options they offer me. And I’ll update the thread.

 

[McOlly101]

Yes I’m sure I’d get used to it but I’m going to go back as it’s only a week old and see what options they offer me. And I’ll update the thread.

After 7 weeks of decathlon having my bike about 3 different bike Technicians looked at it. 2 of them advised me that’s just the way this bike is but I refused to take it back until it was sorted. The 3rd Tech was an e-bike specialist from one of the London stores. He came down to the Farnborough decathlon and sorted it out. Fitted new front and rear brake rotors. Still tekro I think but they’re thicker and flex less under stress. And now all the noise has gone. Took a bit of perseverance and a refusal to take the bike back with the noise but it’s sorted and I can finally start to enjoy the bike.

 

[E-MAD MALC]

After 7 weeks of decathlon having my bike about 3 different bike Technicians looked at it. 2 of them advised me that’s just the way this bike is but I refused to take it back until it was sorted. The 3rd Tech was an e-bike specialist from one of the London stores. He came down to the Farnborough decathlon and sorted it out. Fitted new front and rear brake rotors. Still tekro I think but they’re thicker and flex less under stress. And now all the noise has gone. Took a bit of perseverance and a refusal to take the bike back with the noise but it’s sorted and I can finally start to enjoy the bike.

Well that was a result good on ya
There still a good bike for the money, funny there cheaper now than two years ago

 

[mike777]

Hi everyone,
I know this thread has been inactive for some time, but have a few questions as I'm considering buying e-st900.
Will it take 29in 2.6 (or 2.4) at the front, or does it have to be 29 2.2 max?
Also having 186cm, what would go for? size L or XL ?

 

[E-MAD MALC]

29" On the front no problem quite a few of us have done this
As for the size I would say A large would be a bit more playfully for your height, A Extra Large would be a more relaxed comfortable ride
Hope this helps
I like others have done many mods to these bikes, can believe its £200.00 cheaper now than when I.bought it over 2 years ago

 

[Afc69]

How regularly would you put your E-ST900 in for a service? Not had mine serviced for a few years now, albeit it’s not been THAT heavily used recently.
If purchased from Decathlon, best to go there for the service?

 

[silles]

How regularly would you put your E-ST900 in for a service? Not had mine serviced for a few years now, albeit it’s not been THAT heavily used recently.
If purchased from Decathlon, best to go there for the service?

Never, unless electrical issue.
I do my own service...

Minus electrical its a normal bike

Torque bolts after a few rides. Check chain stretch, lubricate chain etc
Service lower lag about every 600 miles.
Never done uper lag, dont see the need.

What else, check brake pads change if needed. Etc

 

[E-MAD MALC]

How regularly would you put your E-ST900 in for a service? Not had mine serviced for a few years now, albeit it’s not been THAT heavily used recently.
If purchased from Decathlon, best to go there for the service?

I suppose if you have the tools to do your own servicing then it's the most economical way
But if you have could be more economical to have it serviced by Decathlon, give them a call

 

[eggy_poppins]

Hello all
I joined this site last year as I was looking at buying an EST 900 for my Wife.
I bit the bullet and bought one, then bought another for me!

I've seen posts about the bottle mounting (what were they thinking?!?) so thought I'd share my solution.
I bought a generic mounting base from amazon. I then removed the straps from it and cable tied it to the battery.
I can't seem to share the link here, but have it if anyone is interested.
I've been running it like this for a while now with no issues.
I thought it would move around a lot but it's been good as gold.

I live in the French Alps, so the bike sees a lot of very bumpy trails, and all good.
The pic is from this mornings ride
Hope this helps people