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Orbea MX 20 chain line issue

Hi there

I just got a MX 20 Team non-disc for my daughter . -

Really nice bike - frame is amazing - and made in portugal - that is rare
these days that its not china / taiwan made

It has one major issue and i was wondering if you have same issue -
When in 1st gear, and my daughter back pedals - chain comes off in front immediately - BIG BUMMER

Also for other people considering this bike - it is 21.5 lbs -
I expected it to be lighter w alloy frame and fork and nice components

Rims also have not so nice rim joints that create brake knock - hopefully sanding those down will help - but thats where Islabikes does a much better job w machined rims

Anyway - appreciate help / input
 
I also just picked what I believe to be one of the last MX Teams (non-disc) for my son's 6th birthday on Sunday. We have only done a couple of rides around the block and he isn't shifting yet.

In assembling the bike, I noticed the same issue with the chain. I spent a lot of time adjusting the rear derailleur and it still isn't to my satisfaction, but much better than where it started. Hi/Low adjustment seem decent, but the shifting can still be a bit finicky. It seems that the provided gear set might be the absolute limit of what the Shimano Altus might be able to handle.

I had also considered upgrading to a large tire in the future, but given the clearances, I doubt anything larger that the Kenda 2.1s is going to fit on the bike.

Do not let any of that dissuade you! Overall I am extremely happy with the purchase and really appreciate what Orbea has to offer at this price point. My son loves the bike and I can not wait to get out onto a trail with him for the first time.
 
For finicky shifting with the rear derailleur, I recommend yanking the cablebthats in there currently, and putting a new stainless steel, slick one in. My sons bike had the same issue, but it was due to the cable being slightly unwound (one strand was raised a bit) and that caused drag inside the housing and erratic shifting. You won't see this if its the case because it's inside the housing...if that's even the issue. But I recommend replacing the cable anyway. The stock cable is a lower quality stainless cable and a thinner extruded and slicker offering is available from either your bike shop or online. I also dripped Rock and Roll cable magic into the housing slowly for a good amount of time before I sent the new cable through. Shifting has been dialed.

If the chain is coming off the front when you backpedal, the derailleur is not adjusted properly, the chain line is off (relating to bb spindle width, or both. How much room is between the stays and the crank arms when you position the crank at 3 and 9? I'm betting there's room to drop down a spindle width or two. If you know how to measure chain line, you can do that too. It depends on how many rings you have up front and is measured from the center of the bb shell/or seattube (same thing). The number you are looking for varies depending on rings up front (1, 2&3).

Check this out for understanding chainline. It is talking about 1x setups but still has pertinent info for 2 and 3... https://www.oneupcomponents.com/pag...om/pages/understanding-chainline-for-optimal-1x-conversions-boost-and-non-boost

If your derailleur cage is not adjusted right it also could be allowing the chain to drop. People didn't know how to adjust them correctly back when they were on every bike, and now that most bikes are coming out of the schute with one ring up front, shop cats are even worse than back when I was a one. (No offense meant to any shop guys...I was one too. But I could/can dial in a front derailleur and unfortunately that eluded many a wrench...for no good reason) I'll save the front derailleur tutorial unless folks need it. Not complicated but just gotta follow steps just like a rear derailleur.
 
Also, not sure if the 20" frames are tighter in the stays than the 24's or not, but on my sons 24" we could fit a solid 2.4 in there, with room to spare, if there were some decent ones available. Inside stay to stay, both chain and seat stays is measuring 2.69. That's slightly above the tire where the cross section would end up with a larger cased tire. Currently has Rocket Ron's with room to do the backstroke.
 
Ah, I kind of thought they were 1X, but from Pluzall's post I thought the Team might have been geared up front. Shouldn't have assumed.

So that being confirmed, I'd take a look at the chainline on the cranks. I'm betting the bb should be swapped out for a shorter spindled one. All things correct and adjusted, the chain shouldn't be riding off the chaining from backpedaling. The chain angle is pretty harsh due to the shorter chainstays for sure, but that's most likely being exacerbated by incorrect chain line.
 
I've been digging into a 20" in bike for a while. If you are doing dirt and getting some downhill, I'd definitely look at a decent air fork like the Spinner 300 or something similar. It definitely is safer. (FYI not like the boat anchor on the RipRock, you were right to avoid that). I've seen my kid hit the downhill slope and the trail roots/rocks on the slope are certainly ripe for tossing him. He can do it with body position today but he has gone over the bars before he was more experienced. A fork will help depending on your terrain.

Also, I'd find some hydraulic disk brakes. The V-Brakes issue is that they aren't super effective on sketchy terrain and your kid can get fatigue with them if they are braking over extended periods. Kind of have to adjust them a lot too as the brake pads wear. I hate doing it on my kids 16". Plus the short brake handles don't have a long pull...this makes the V-Brake issue even more annoying as the margin for error and how tight your brake pad has to be is slim.

Your chain could be fixed with a clutched derailer shortcage like the Zee or SRAM GX.

I got a chance to chat with the owner at Prevelo cycles (I'm kind of ignorant to a lot this) and he was cool enough to talk about some of the kids gear on these bikes. It was enlightening. Especially if your kid will be using his bike for a while/alot/challenging terrain.

21+ lbs is super heavy for a nice$$ rigid fork 20" bike. That's odd. Isla Beinn is a similar bike at 17lbs.

I'm interested in what you think about those Smoker tires. I agree the Small Block 8 isn't really appealing unless you are just basic trail riding I guess. Maybe the Maxxis MaxxDaddy is better? I don't see a ton of options in 20" tho.

As your kid is just getting into pedaling...I would absolutely get him some light pads. We got the G-Form pads for elbows and knees and they have been awesome. They look cool, but more importantly they are comfortable enough that my son actually uses them. They save our day all the time. I do wish they went down to cover his shins tho...I still need something to help there. Also, gloves have been great too. Any fall seems to always include his hands.
 
I did a ton of research on 20" bikes as well, prior to placing my order for the MX20 Team. Like, 28 column, 50 row spreadsheet style research. :) And I agree with you on the need for wider availability of some decent air fork options at a reasonable price. 99% of what you see on these kids bikes is heavy, garbage "suspension" forks. That is one of the big reasons I went with Orbea over some of the other options. There are a few 20" air fork options, but most of them are as costly as the initial bike purchase or near impossible to find. I really wish Suntour would release a 20" version of their XCR LO Air. I could justify dropping an additional $150 on the bike, but there is no way I could get my wife to even consider spending $445 on something like a Brood air fork on a bike my son may use for three years.

The other thing to take into consideration if you purchase an MX20 Team, is that the upgrade from V brakes to disc (mechanical or hydraulic) isn't quite so simple. The frame and fork will accommodate the upgrade, but the hubs do not have disc brake mounts. That means you either need to re-lace the with disc brake hubs, or more likely purchase a new custom built wheel set. Just looking at those two upgrades, you can see where purchasing an MX20 Team (and most other kids 20" bikes) with the intention to upgrade isn't all that wise. You're much better served to pay up front for a bike equipped to a level that will satisfy your child (read: yourself).

I took a look at Prevelo as well. The Alpha Three's biggest advantage is the weight and stand over height. The Zulu Three is nicely equipped for the money, but well beyond what we were willing to spend for a short term bike. In the end, the MX 20 Team just seemed like a better deal for us (because there were no 20 Team Discs available anywhere).

In terms of protection, we plan to pick up some G-Forms pads for our kiddo. We already scored a great deal on a small Bell Super 2 MIPS which fits him extremely well. If you're shopping kids helmets, I would highly recommend looking at clearance sales for adult smalls. Sizing is often the same and you can find some very nice deals.
 
For you guys that are looking at suspension but leery of cost, I'd consider giving Spinner an email. They'll sell you forks direct.

That said, I don't think they're necessary in the least. Getting the tires to a good pressure ( yes, the small block eights are a fine tire when you don't run them at concrete psi) will do more for your kids handling than a questionable fork on the front end of a hardtail. Volume is the key, with proper pressure. I ran my sons SB8's on his rigid 20" at about 12.5 psi. He rode everything from smooth single track to rocky, rooty tech with nothing but climbs and chunky descents. No problems whatsover. Cleaned stuff that some of the older S-works riding racing crowd would get off and walk. The tires and lack of fork aren't the issue in the least, but they will be if you set them up wrong and look for gear to compensate for technique when they need to be learning it. Look at Spawns Brood tires in 20" for a decent volumes tire with moderate tread. Unfortunately, there just aren't many options available for 20 or even 24 that are worthy tires.

For pads, if they are absolutely necessary, keep looking into finding stuff for kids. G form and Troy Lee Designs are good places to look. The adult small, even women's small, is guaranteed to have them swimming in it if they are at proper body size for a 20".
 
Bike Bling has some of the non disc versions in stock or can get them in a week depending on color preference. I ordered my son one today because I was tired of waiting for the disc version plus he is 40 lbs, we live in Colorado and i still cant see a scenario where v brakes aren't enough for him.

The guy at Bike Bling said the Disc Version will be available Sept 18th for anyone wondering. A local shop here told me 45 days about two weeks ago so seems legit.
 
I picked up a used (for a weekend vacation) Orbea MX 20 Team for my son today. It was $250 at the local bike shop, which represented a much better value than the entry level Giant XTC Jr., Cannondale, Trek Precalibur, etc. that I could get locally. It felt lighter and appears to be very well built and have higher quality components to boot. It was down to the MX 20 Team and the GT Stomper Prime, and the Orbea seemed like a substantially nicer bike.

He turns five next week, but is very large for his age. It may still be a hair too big, but he was towering over his old 16". He got the blue one with pink accents...so he will definitely stand out.

Anyway, lots of good info here. I really appreciate it. He's stoked about it, and I, like many of you, cherish our family rides. Having him be even more excited about them is going to be great.
 
I got my son's non disc version in this weekend. I was surprised to see the internal routing for the derailleur. I was also surprised to see a 70mm stem, i'll be replacing that with a shorter one. I ran into the problem with the chain wanting to jump off in the lower gears like others and it was pretty obvious the derailleur hanger was bent pretty bad. It is pretty damn flimsy actually. It appears to be the weak link on an otherwise solid build.

I noticed it has holes for a water bottle cage, has anyone had any luck finding one that fits and will hold some sort of bottle? My kid would be jacked if I could make that functional for him.
 
The water bottle location in the main triangle of my sons 24 is not really well placed, to be honest. I'm figuring that on the 20 it might possibly be even worse. I haven't done anything about it yet as I just let him drink from my bottles on rides, but I have been figuring a functional set up could be had with a side loading bottle cage like the Specialized Zee cage and a smaller bottle (21oz). If that isn't enough, something like this should make it work by moving the whole thing down the downtube further and closer to the seat tube a touch... Jenson USA - Online mountain & road bike parts, clothing and accessories shop | Jenson USA

There's also a set of mounts on the underside of the downtube on my sons 24. Not sure I'd use them, and probably better suited for mounting a mud guard.
 
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