Rockrider E-st 900 changes upgrades

[luckyOne]

Yes, it's on the left side, so cars see it better. And it's quite cheap, even original in local shop costs about 10€.

 

[BeBiker]

It looks good, but is that high enough to be seen in traffic ?

 

[BeBiker]

another day, another Aliexpress "present"

Page Not Found - Aliexpress.com

I'm in between bike sizes, and my bike is a L, with a 80mm stem.

That's a lot better !

 

[DT36]

Loving this thread.
Have recently got back into cycling and was struggling on my Normally Aspirated Mountain Bike (52 year old), so purchased a Rockrider eST900. This has now opened up so many more routes for myself and am really enjoying riding again.

Also purchased a 38T Chainring, from reading this thread, as 50% of my riding is on country roads. My current 32T chainring is maxing out at about 22MPH. I want to continue riding as the wetter winter starts to come in, so will then be doing mostly road rides.

Went to change it last Saturday to do a comparison ride the following day, but failed due to not having the correct tool for the Chainring Bolts. Is this a simple task with the correct tool/spanner?

Having now seen your mod to the stem clamp, I may also consider this. I purchased a Medium frame according to the chart, but think I could have gotten away with a small at 5' 7".

Please keep the updates and modifications coming.

 

[BeBiker]

Hey, thanks for the reply, I see you enjoy the same bike a lot.

The 4 chainring bolts are Allen-key 5mm. That's all you need. Maybe a small rubber hammer or very small wood block.

I discovered the presence of the derailleur-clutch.
It's a small lever on the derailleur and when you engage it, pulling the chain gets a lot easyer.

 

[DT36]

Hey, thanks for the reply, I see you enjoy the same bike a lot.

The 4 chainring bolts are Allen-key 5mm. That's all you need. Maybe a small rubber hammer or very small wood block.

I discovered the presence of the derailleur-clutch.
It's a small lever on the derailleur and when you engage it, pulling the chain gets a lot easyer.

Hi BeBiker,

Thanks for the reply.

The issue I had with the Chainring Bolts was the captive nut on the rear. Basically, when putting the Allen key in the bolt, the rear was spinning. This is a circular captive nut on mine with two small cutouts.
I guess I need to buy a small spanner or tool for this.

I think the 38T Chainring will be better for winter road riding, so looking forward to how you are getting on with it.

Xtreme Chainring Nut Bolt Tool / Wrench / Peg Spanner, Model: Screw Arm-II 2000001845400 | eBay

Chainring Nut Wrench. • Chainring nut wrench. • For easy mounting of the chainring nuts.

www.ebay.co.uk

 

[BeBiker]

Indeed the back on mine were somewhat spinning too. But touching them with a finger held them while rotating the front, not much space in there !

 

[The Old Gaffer]

Here you see the connections of the Brose-T engine.
2-pin wheel sensor below.
5-pin for HMI somewhat higher.

Anybody knows what the other connections are for ?
It think, the 2 above are 6V for front- and back light, but there seems to be another 5-pin (?) below.

View attachment 38992

Hi the 5 pin socket presumable fits this accessories wire from decathlon spare parts?

https://www.decathlon.co.uk/p/e-st-900-accessories-wire/_/R-p-201706?mc=8555704

 

[BeBiker]

That's the one that is already on the bike, it goes from Motor to the HMI, with the usb charger port etc.

 

[chamaruco]

if you like mods Decathlon Rockrider E-ST900 - EMTB Forums

 

[DT36]

Just noticed a big price hike on these in Decathlon UK store. Now £1999.99
Been trying (unsuccessfully) for a few weeks to get a Small frame Women's E-ST900 for my wife, as she's been riding my Medium and really likes it. This has put me back on my normally aspirated MTB though when we're out together
I may have to cough out a touch more though if they remain out of stock in the Small and go for a Haibike from Tredz in Swansea.

 

[DT36]

No Haibikes available in small size anywhere and pre order delivery is August 2021.
Logged onto Decathlon store this morning and they had a small size Rockrider E-ST520. Just bought it, so waiting on delivery now.
I think the small will be spot on for her, as she manages Ok on my medium E-ST900. Frames are basically the same, just the components are a slightly lower grade.

 

[RonnieX]

This Winter I’ve swapped my tyres over to Continental Cross Kings, still kept 2.8 width as I often ride up and down the beach.

I’ve had my first attempt at going tubeless which, 30 miles later, seems to be working well.

I’ve swapped the chainring over to 38t. This has made a noticeable difference.

Adding a beavertail rear mudguard and a crud XL front fender has afforded me and my bike some protection!

 

[RobertW]

Well after some more modifications, this is how it looks actually:

View attachment 39770

What tire model is in the photo?

 

[BeBiker]

Maxxis Rekon+ 27.5+ 2.8 Skinwall

27.5" Tyres

Purchase everything your bike needs in the Tyres - 27.5" Tyres category in our shop.

www.bike-components.de

 

[Gary Davis]

Hi,
Has anyone ever thought about replacing Tektro brakes with shimano ones ? The BR-6120 seems to be the best value for money but I wonder if there is enough room for a 4 piston caliper for the rear one due to the shape of the down tube. I really like this bike.

 

[chamaruco]

@Gary Davis

if you like mods Decathlon Rockrider E-ST900 - EMTB Forums

you'll find my mods (xt..)

 

[Gary Davis]

@Gary Davis
you'll find my mods (xt..)

Sorry, it seems I "skip" the brakes among your modifications. Do you confirm your xp at the rear are the 4 piston series ?
I would also have liked an additional 29 "road" wheelset with thinner tires to keep the same circumference but the swingarm is too short. That's why there no "switch and ride" option for this bike at D4.

 

[Zimmerframe]

D4

For anyone unfamiliar .. In France and lots of places, Decathlon is called D4 for short . Four in French is "quatre" pronounced "cat" to the English ear. So Decathlon - D cat - So written D4 !

 

[Gary Davis]

For anyone unfamiliar .. In France and lots of places, Decathlon is called D4 for short . Four in French is "quatre" pronounced "cat" to the English ear. So Decathlon - D cat - So written D4 !

No. That's because I removed the catalytic converter on my E st900. Then, it's now D cat !

 

[chamaruco]

Mine is a “simple” one piston xt. Enough to unseat you like a wild horse if necessary. 203 rotor and sunrngle Duroc 30 on front wheel

 

[Gary Davis]

Thanks. Looks really great !

 

[DT36]

Think most of my little tweaks/mods are now done. List to date is: Ergon Saddle, Raceface Ride Pedals, Deathgrips, 38t Chain Ring, Maxxis Ardent Tubeless Tyres and finally a RockShoxs QR Front Maxle.
I can now fit the bike in the back of the car much easier that the front wheel will quickly come off. Previously I had to loosen the handlebars and put a blanket up against my front seats for the wheel to sit on. That's in a VW Tiguan which is fairly roomy with the seats down.
Also, the tyres are smaller at 27.5 x 2.40 and now fit better in my wall mount. The bracket was fairly tight before, but plenty of room now. Not taken them up the top of the Valley and forest trail yet, but they seem to roll nice on the road, albeit ever so slightly louder than the Hutchinsons.

38t Chain Ring is also so much better when riding on open roads, as it does not max out at 22mph anymore.

I'll report back on the tyres soon, as the snow and ice seems to be behind us now and hopefully get out this weekend with the Wife on her shiny new E_ST520. Hopefully I'll be able to keep up with her...

 

[BeBiker]

Nice modifications !

... the tyres are smaller at 27.5 x 2.40 and now fit better in...

Good you talk about this.
I don't really understand those 27.5x2.8.
When not fully inflated they swing the whole bike from left to right, and when fully inflated, why not just use 29x2.20 or 27.5x2.20 ?

I think about changing to 2.20 2.30 2.40 too...

 

[Gary Davis]

Nice modifications !



Good you talk about this.
I don't really understand those 27.5x2.8.
When not fully inflated they swing the whole bike from left to right, and when fully inflated, why not just use 29x2.20 or 27.5x2.20 ?

I think about changing to 2.20 2.30 2.40 too...

You are right about those 2.8 but be careful with too narrow tyres because the lowest limit width for the rim is about 60 ERTRO. I really regret that the swing arm is about 1cm too short because two narrower 29 rims would have been perfect for more rolling terrain.

 

[BeBiker]

29" would have been nice, but 27,5 with smaller tyres will also lower the bike a little.
In my case the upper bar is a little above ball-height, every millimeter counts

 

[chamaruco]

Go with 2.60 and you’ll not regret

 

[Gary Davis]

Go with 2.60 and you’ll not regret

That's what I was thinking to do. Seems a good compromise. At least for more "gravel" than asphalt.

 

[Gary Davis]

29" would have been nice, but 27,5 with smaller tyres will also lower the bike a little.
In my case the upper bar is a little above ball-height, every millimeter counts

Seems we have same ball-height concerns

 

[BeBiker]

Go with 2.60 and you’ll not regret

Thanks, is 2.8 to 2.6 such a big difference ?

(looking for Rekon-style 27.5 2.4->2.6 Skinwall, not a lot of choice...)