Rear rim for 26'

[basstrials]

Hi everyone.The market of the trial rims seem to be too tight and there are very few options to build a rear wheel.I would like to have a spare one so i did start to check the sites out and i did find that main offer is Jitsie as well as Coma and few offers of Hashtag and Echo SL.

My question is :

Which rim is strongest of them (because i am 96kgs) in term of building?

P.S. I know about the Trialtech but i did not find any.

Thank you in advance.

[cwtrials]

If you can find an echo double wall rim somewhere, that would be the strongest.  (I'm 105kg)

 

I've had good luck with the play 26" rear rim. The cutouts aren't crazy small and it has an I-beam shape.  IMO single wall rims are stronger with the I beam profile.  Some of the rims without I've had the sidewalls bend in on impact.

I'd say the echo single wall rim isn't the strongest I've tried.

Edited September 1 by cwtrials

[basstrials]

Thank you,i did look for this Play rim and did not find any in black color.Which other brands offer i beam shape rims as well?

 

[Chakers1998]

Clean and Jitsie rims seem to flat spot easier than most. Hashtaggs are better but people still flat spot them as well. Andrei Burton said to me he started using an old Echo rim because he kept denting the Hashtaggs, but he does crazy stuff. Shame that the manufacturers put their min order number up, as Trialtech had to stop the Carthy rim because of this. 

[basstrials]

I do not know what the reason is but the choice of rear rims is disappointing.I did not find any Trialtech rims anywhere and it is looks like their site has not been updated since long time.Are they still exist?It is shame that you can't buy directly from them stuffs.I have one Echo TR rear wheel with double wall rim in very good shape but it is not grinded so i would like to keep it this way for now to have another one and to grind it.I still learn to backhop so...

Maybe i will take Hashtaggs.

So,do we going to end of the bike-trials sport because of the lack rims of? 

Edited September 6 by basstrials

[basstrials]

In the end,i did buy rear wheel (Play rim and Echo hub) and Trials bike shop did light grind for me but when i took a look at it is seems that i had to tell them to do medium one.This light grind is,i guess,what supposed to be and maybe it was my mistake to not order a medium one,anyway.It is my first grinded rim so i do not know what to expect because i ride only smooth so far(Jitsie pads for smooth tims are awesome,both for HS and Vbrakes).

Edited September 21 by basstrials

[La Bourde]

I prefer light to medium grind even if I have to repeat it more often.

A fresh light grind seems better to me than an old medium one.

It is more time consuming though, but having a reliable rear brake is very important.

[basstrials]

La Bourde,how you do light one?With thin disk?For metal or stone?What angle?

Thank you.

[craigjames]

I used to us a thin metal cutting disc or a ceramic/stone cutting disc. Somewhere between 45 and 90 degrees to the rim. Always gave a nice sharp and not to deep grind, although the rim you use makes a big difference to the performance of the brake. Some rims just don't grind well or hold a grind for very long. I always used proper Coust pads on the rear.

Edited September 21 by craigjames

[La Bourde]

I do the same as craigjames described: I use an angle of 45°, sometimes a little more and a disc for metal cutting. Light but sharp.
I had good results on Crewkerz/WaW and Clean rims.

Somehow I prefer the Crewkerz pads to the Coust, but I do not ride much in wet condition (and I think the Coust I have are too old).

 

[basstrials]

Are some of you have tried  grinding some old or unused rim for training?I think i going to try on some old one beforehand just for experience

[La Bourde]

You cannot really do something wrong, as long as you do not apply too much force or spend 10minutes on the same spot. So if your goal is too have a light grind, the worst that can happen is that it is too light.

You can try on a old rim too. You can also try to grind some inches of the new rim and observe the result and learn from it.

The goal is to achieve a sharp grind and the angle of the grinder is basically the only variable (you can estimate the speed by watching a tutorial and the force to apply is as light as possible)

Ali C has a good tutorial (with adamR28 as guest).

 

[basstrials]

I did watch this video and is helpful but i did not understand clearly about the directions of grinding.So if i do sprocket side in  clockwise direction,what direction about other side should be? Clockwise again or anticlockwise?

Thank you.

Edited September 22 by basstrials

[La Bourde]

Once you are done with the first side in the clockwise direction, you flip the wheel and grind again in the clockwise direction.

[Jere_h]

The Trialtech Carthys are unfortunately discontinued and when I realized that I decided to order the last one I could find, just for a spare. Those are so good that the old one I've ridden 4-5 years now is still perfect... With natural riding only (and avoiding sharp rocks), I might never need to buy more rims than these..

From weight weenie perspective though, the Hashtagg is tempting but I really appreciate lateral stiffness too, so.... I think no single wall can match the double wall design.

When it comes to grind, I'm super lazy. I do a very light grind using a Bosch mini angle grinder (can't grind at home so need a battery powered tool) with diamond cutting disc, once or twice in a year and ride until it starts to feel "wooden" and slippery. With V-brakes that is mostly a non issue, with the TNN black pads it seems to work well even with a worn grind and I kinda like the idea of not generally using too much brakes. That's something I've been trying to learn actually, to rely more on the balance and chain tension (watch Charlie Rolls).

What I don't like about a very harsh and effective grind, is the difficulty to release the brakes quickly. It feels like it always grabs a little bit too much. I've generally managed to do the biggest gaps when the grind is starting to loose its sharpness.

[basstrials]

It is seems that many people likes and prefer light grinding and giving to their rims more life.It is sad that Trialtech Carthys rims are no longer available mostly because they were one of the most reliable and strong product (despite i am not having one) for trials.I wish i had more skills like C.Rolls or Flipp and not using brakes but i am not so.

Does anyone could tell something about this:

I have set my pads very closely to the rim,maybe 1-1.5 mm close but my rim is not grinded.So,if i do same set up on grinded one would be a problem been so close?

Edited September 26 by basstrials

[Jere_h]

Yeah considering all the randomness and loose tolerances in HS33 (pads wiggle a bit, a bit sticky pistons sometimes etc.), it might feel like they're too close and sometimes grabbing when you don't want to. Rim brake is generally not very precise, it's better to be used with a large lever throw like on-off. This is one of the reasons I like Vees, they just feel more precise and I like to run my levers close to bars to minimize arm pump. With a good V setup there is 0 play in any direction so it's quite well predictable too when it touches the rim.

[basstrials]

12 hours ago, Jere_h said:

Yeah considering all the randomness and loose tolerances in HS33 (pads wiggle a bit, a bit sticky pistons sometimes etc.), it might feel like they're too close and sometimes grabbing when you don't want to. Rim brake is generally not very precise, it's better to be used with a large lever throw like on-off. This is one of the reasons I like Vees, they just feel more precise and I like to run my levers close to bars to minimize arm pump. With a good V setup there is 0 play in any direction so it's quite well predictable too when it touches the rim.

This is quite true.I have v-brakes,Tnn pads and Heatsink yellow,smooth rim on my other bike and i feel same like you,zero movement forward and backward.On this Echo i have HS33,Jitsie and smooth rim as well and i am not feeling this set up so securely.There is wiggles(knocking too) and is swiping sometimes,which is annoying because i  practice backhops and make me bailing off.Maybe i am going to change this Magira to v-brakes, overall feeling is much better to me.

Edited September 27 by basstrials