cardenas_26trials Posted January 29, 2013 Report Share Posted January 29, 2013 Hello everybody, Well I bought a Trial Zone rear brake (IS mount) about two months ago (installed on a ZOO! lynx) which came with the original Hope trial zone rotor. It worked really well, had loads of bite and hold, etc. but, once when I did a gap to rear wheel, the rotor bent (I really did several tries to make it straight again or at least usable, which didn´t work out). After that, I had to use a shimano rotor for about a month until I ordered a new Hope one (It was really good actually, but just not the same! and made a lot of weird noises haha). Thing is, the new hope arrived about 4 days ago off tartybikes (happy times!), I got it installed, nicely centred, everything tight and ready.... Lasted three days of riding, same thing happened. Gap to rear wheel to bent rotor I DID NOT hit it, it was a gap, I,ve got a protector and I'm left footed. Also there are no marks on the disc. My conclusion? The trial zone rotor is too weak to be used on the rear wheel. I just can't get another explanation for it. In fact I haven't seen many pro riders using it (except Theau Courtes). My setup was correctly installed, I insist. The wheel was spinning freely and the brake lever had a beautiful feel. Also, I'm not a heavy rider, I'm about 64kg (141 lbs). It is really frustrating and annoying, now I'll have to order another stiffer rotor which can perform well and wait for about a month or more (delivery to Chile isn't the fastest). I obviously will try to make it straight again, but it won't be the same. And I know it will bend again (will move it to the front) Has anybody of you had similar experiences? Or I'm doing something wrong ? And, what other options do I have? My best bet I think is the original Hope Trial rotor or an Avid maybe? Help please! any advice will be heard... Sorry for the excessive parentesis Cheers from Chile! Esteban. Quote Link to comment Share on other sites More sharing options...
bing Posted January 29, 2013 Report Share Posted January 29, 2013 a lad I ride with has a trial zone on the rear of his rockman Austin, with the 160 trial zone rotor. as far as I know, he is problem free. and his make a funny squeaking/grinding noise when he uses them. they do feel good though Quote Link to comment Share on other sites More sharing options...
cardenas_26trials Posted January 29, 2013 Author Report Share Posted January 29, 2013 a lad I ride with has a trial zone on the rear of his rockman Austin, with the 160 trial zone rotor. as far as I know, he is problem free. and his make a funny squeaking/grinding noise when he uses them. they do feel good though Is he running the PM or IS caliper version? I have a friend who runs the PM version without any problems. Maybe it has something to do with that? who knows Quote Link to comment Share on other sites More sharing options...
dezmtber Posted January 29, 2013 Report Share Posted January 29, 2013 Yep Ian using pm with adaptors. 160 on the mod and now using 180 pm on a 24" no problems. Look at fails video on the congleton video. The rotor is still ok to ride after a bit if a tweak Quote Link to comment Share on other sites More sharing options...
bike_dummie Posted January 29, 2013 Report Share Posted January 29, 2013 What size is your rotor? Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted January 29, 2013 Report Share Posted January 29, 2013 Do you have any pictures of your setup please? Quote Link to comment Share on other sites More sharing options...
bing Posted January 29, 2013 Report Share Posted January 29, 2013 just a thought mate, don't take this the wrong way but have you got the disk on the right way round? Quote Link to comment Share on other sites More sharing options...
cardenas_26trials Posted January 29, 2013 Author Report Share Posted January 29, 2013 What size is your rotor? 160mm Do you have any pictures of your setup please? It is the best I can offer for the moment haha, sorry. Later I'll update better ones just a thought mate, don't take this the wrong way but have you got the disk on the right way round? As far as I'm aware, it is on the right way round.... Thanks guys! Quote Link to comment Share on other sites More sharing options...
dezmtber Posted January 29, 2013 Report Share Posted January 29, 2013 All the stuff you have looks right in the picture. It could be a fail due to the only two things I can think of. When you fit the rotor do all the bolts till there half a turn of, then pull the rotor in the direction which it will take the brake force and tighten the bolts nice n tight. I have been told but never heard of it happening of the rotor moving around the tight bolts so the leading edge comes into contact with the bolts, which in some rare cases can bend the rotor. Or of the hub isn't champhered on the bolt threads. The same could happen. To check this take the rotor off and look at the threaded part of the disc tabs. If the holes are not countersunk it could be causing you issues but this usualy only causes noise from the brake. But we are talking trials abuse so it could cause unnessasary stress in the rotor Can we have a photo from the back so we can see the rotor running through the caliper to check your alignment Quote Link to comment Share on other sites More sharing options...
Ali C Posted January 29, 2013 Report Share Posted January 29, 2013 I have two more options that could cause issues. 1) the rotor may have missed the heat treatment process. It's rare but I've seen it before, the rotors are easy to bend by hand. 2) the disc mounts on the hub could have twisted restulting in the rotor bending into a "bowl" shape. It's unlikely it has done that but you never know. 1 Quote Link to comment Share on other sites More sharing options...
trialsiain Posted January 29, 2013 Report Share Posted January 29, 2013 Im sure my cousin had same problem..ill link him this topic 1 Quote Link to comment Share on other sites More sharing options...
Rockman Posted January 29, 2013 Report Share Posted January 29, 2013 (edited) Im sure my cousin had same problem..ill link him this topic I did have it too, I sent it back to hope and they replaced it, but I think it's the same again.. Edited January 29, 2013 by Rockman Quote Link to comment Share on other sites More sharing options...
ghostrider88 Posted January 29, 2013 Report Share Posted January 29, 2013 Rear rotor should be mounted other way round for trials. Quote Link to comment Share on other sites More sharing options...
dezmtber Posted January 29, 2013 Report Share Posted January 29, 2013 No you would more likely snap the arms on the rotor doing that Quote Link to comment Share on other sites More sharing options...
ghostrider88 Posted January 29, 2013 Report Share Posted January 29, 2013 Ehm,no. Quote Link to comment Share on other sites More sharing options...
dezmtber Posted January 29, 2013 Report Share Posted January 29, 2013 You sir are nuts Quote Link to comment Share on other sites More sharing options...
ghostrider88 Posted January 29, 2013 Report Share Posted January 29, 2013 You clearly don´t understand direction of forces in trials. Quote Link to comment Share on other sites More sharing options...
Blake Posted January 29, 2013 Report Share Posted January 29, 2013 why would you run it the other way around? You clearly don´t understand direction of forces in trials. So you're more likely to loop out than go down to bash? Quote Link to comment Share on other sites More sharing options...
dezmtber Posted January 29, 2013 Report Share Posted January 29, 2013 I quite often find myself flying backwards across gaps I also heard taps are best done in reverse. Yes there are backwards forces involved the ones that are generaly helped out by those things on the ends of your legs Quote Link to comment Share on other sites More sharing options...
ghostrider88 Posted January 29, 2013 Report Share Posted January 29, 2013 why would you run it the other way around? So you're more likely to loop out than go down to bash? Exactly opposite, so wheel is more likely to spin backwards than forwards, hence the rotor should be mounted other way round as front rotor, where 90% of forces is trying to spin wheel forwards. Quote Link to comment Share on other sites More sharing options...
dezmtber Posted January 29, 2013 Report Share Posted January 29, 2013 Explain properly then ? U can't just say the forces go backwards more because I say so Quote Link to comment Share on other sites More sharing options...
ghostrider88 Posted January 29, 2013 Report Share Posted January 29, 2013 How many times you see someone with disc brakes loop out?Now how many times you see someone going to bashplate after failed bunnyhop/gap?I´m yet to see someone with hope brake to loop out, but I see them landing on the bashring every ride because the brake just isn´t able to lock that amount of force...It´s basic stuff and you will get that as soon as you start going bigger(Or gain some size). Quote Link to comment Share on other sites More sharing options...
dave33 Posted January 29, 2013 Report Share Posted January 29, 2013 I reckon Ali might be right. Maybe it was tempered abit to much. I would send it back to hope Check your bearing in the hub arnt lose to I also fitted my trial zone rotor line that on my 20" and never had a problem. They are pretty light though. I think it's how it's pictured in the little manual that come with the brake. But can't remember 1 Quote Link to comment Share on other sites More sharing options...
customrider-Rhys Posted January 30, 2013 Report Share Posted January 30, 2013 How many times you see someone with disc brakes loop out?Now how many times you see someone going to bashplate after failed bunnyhop/gap?I´m yet to see someone with hope brake to loop out, but I see them landing on the bashring every ride because the brake just isn´t able to lock that amount of force...It´s basic stuff and you will get that as soon as you start going bigger(Or gain some size). might give this a go, see if your right, or not. 1 Quote Link to comment Share on other sites More sharing options...
marko Posted January 31, 2013 Report Share Posted January 31, 2013 rotors usually have to be mounted in the right direction so that braking force compensates stress from heat expansion. In Trials: almost no heat. I don't think it makes a big difference here. Quote Link to comment Share on other sites More sharing options...
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