Sam Song

I9 Hydra can be expensive but it is very worth it. Since the current trend of MTB bikes is silent rolling hubs, many people are selling their Hydra hubs for quite cheap where I am. Also don't worry too much about the aluminum drive shell, it is okay as long as you have a wide base 7mm or more base cog on it.

Industry Nine Hydra, Spank Hex are all good options. My top choice would be Industry Nine Hydra. They have near instant engagement and have been relatively reliable for trials use.

Apparently, the Single Speed Hydra Rear hub in 135x12 through axle configuration actually uses Torch 135x12 endcaps instead of the Hydra one. Unfortunately, they do not mention that in their sales page. The Hydra Classic rear hub will accept the Hydra 135x12 through axle endcaps.

I emailed Industry Nine about this so I will just update the thread when I hear back from them.

I bought a spare Industry Nine Hydra wheel from local Facebook marketplace with the following specs: - Hydra rear classic 142mm thruaxle. I figured i could make use of this rear wheel by swapping the 135 through axle endcaps from my rear Singlespeed Hydra that fits on my Hex. As it turns out, the end cap from my singlespeed Hydra does not fit over what appears to be a smaller axle on the new Hydra classic 142 through axle hub i bought. The endcap will wiggle over it. You can see that the Singlespeed axle on the left has a larger diameter What axle do I need to make my non boost classic Hydra work on the Hex? Industry Nine sells 135 x 12 endcaps but it does not specify whether it is for Singlespeed rear or Non-boost classic rear.

Inspired Hex features a integrated headset, so the top part below the stem is just the top spacer of the headset. Inspired comes with a tall cone headset spacer from the factory. You should be able to find a short stack headset spacer like I have from your local bikeshop. They come in different internal designs for different headsets so you may have to try a few to make sure it fits the headset in the Hex without resistance. This will then allow you to run a shorter steertube. Doing this and replacing with carbon spacers as pictured saves you free 20 grams at the stock Inspired fork steertube length 😄. As for the viability of those forks for street trials riding, I think it depends on how big you are going to be riding as the weight saving from those carbon forks do not come free. I believe there is a photo of the snapped WAW carbon forks on a Hex on Instagram from one of the UK riders. Forks is one of the few parts I do not mind going heavier but rugged on a bike.

In the past not too long ago, rear hub spacing on frames were quite simple with 26 inch frames being 135mm and 20 inch frames being 116mm. There was a brief period of manufacturers introducing "modstock" spacing with 116mm rear spacing for 26 inch frames but they did not end up sticking around. Nowadays, Clean has their proprietary 120mm rear through-axle. Jitsie is running 116mm rear spacing. And Inspired is running the usual 135mm through-axle. Were these different standards really necessary? It makes switching parts between frames very hard nowadays. I would personally love to see bike companies going back to 135mm spacing with a choice between bolt-on and through axle. Meanwhile, the rest of the other single speed DJ frames in the MTB are happy sticking with the usual 135mm/142mm spacing.

I think as stated by @La Bourde, it is likely that your scale is off. As 9.15kg would be very light for street trials. A standard Fourplay Team build weighs 10.38kg. Are the parts that different from the Team build to make for 1.2kg worth of weight difference without carbon or titanium parts? https://www.tartybikes.co.uk/24_inch_trials_bikes/inspired_fourplay_team_2023/c50p14124.html?pos=4586.22216796875&search_params=YTo4OntzOjg6ImluX3N0b2NrIjtpOjA7czoxMjoiY2F0ZWdvcnlfaWRzIjthOjE6e2k6MDtzOjI6IjUwIjt9czoxNjoiY2F0ZWdvcnlfcmVjdXJzZSI7YjoxO3M6ODoia2V5d29yZHMiO3M6MDoiIjtzOjk6ImJyYW5kX2lkcyI7TjtzOjQ6Im1vZGUiO3M6MzoiYWxsIjtzOjQ6InNvcnQiO3M6OToicHJpY2VfYXNjIjtzOjEwOiJjb3VudHJ5X2lkIjtzOjI6IjQxIjt9

Spokes are cx rays and nipples are aluminum already. I don't think the difference between the disc brakes is that much. Tarty quotes Hope trials brake weight at 289 grams and Magura MT7 weight at 277 grams. That's barely more than 10 grams difference in weight.

Extention is a shady company to deal with. I talked to them via Facebook asking to buy a fork from them directly and never heard back after them telling me they would get back to me. Their fork will make the head angle a bit steeper and the bike a bit shorter. I find the current geo with the Inspired fork to be a good mix between street and trials. I am not sure I want to make it streetier with the Extention fork. Lastly, I really shouldn't make any complaints about my Hex. Hahaha The bike is more than good enough and light enough in reality. It is entirely my shortcoming for not making the moves I can't do on that Hex.

Everything is titanium except for brake bolts (by choice, for extra peace of mind). So with a pretty much maxed out Hex build, I am still barely below 10kg, which is pretty impressive but still heavier than what others are posting.

I have no idea how mine weighs barely below 9.9kg and yours is 9.3kg. My Barzo tires weigh in at 700 grams each and your Billy Bonkers weight ~580 grams each (per Tarty). That only makes a difference for ~240 grams for both tires. I have a Rimpact insert that weighs 90 grams, so all together i should have ~350 grams more in the wheels. You have your custom tensioner whereas mine is a stock Inspired one. But I doubt the weight difference would be that much. But I have Canecreek Eewing cranks, Stamp 11 Ti pedals, E6 BMX one piece seat with shaved off post (weighs 94 grams), and 7 inch rotors instead of 8 inch rotors on your Hex. I can't even think of anywhere else I would save weight other than if I went with carbon forks, carbon handlebar which would change the geometry too.

You will need to install a tubeless insert on the rear with that tire. Otherwise you will be hitting the rim very easily.

I am going to bump this thread. Anyone doing this for their trials bike? How often do you have to redo it? Do you recommend hotwaxed chain for trials bikes?

They do, but they have discontinued parts for all of their legacy products so you won't be finding any hub parts to swap for. Unless you already have a King hub, not a good idea to get one now with no OEM support from them.

I would say I9 Hydra is the best if you have the money, Hope Pro 5 Trials if you are on a budget. Another option would be a Canadian company called Tairin. They have a fairly high engagement point but their hubs are not single speed specific, so the flanges are a bit narrow. I am glad that I9 supports single speed 135 spacing even if they may not sell much in that option.

If anyone was wondering, the E6 carbon seat in 27.2 reg size version goes down to 94 grams with the seatpost shaved.

I suppose the rim logos aren't for everyone. For me, it's my second wheelset from them and love the look of the wheels. I am somewhat new to having trials bikes with seats but my understanding of the main purpose for a seat in a trials bike is that it protects your bottom parts from getting a penetrative injury from the seat tube poking you 😳. I understand that the current fashion is to have the seat point up with the same angle as the top tube. But isn't it actually safer to have the seat angle closer to horizontal angle for the protection purpose? If the seat is pointed up, the front narrow part of the seat could also poke you in the wrong place. I could understand the benefit of the having the seat angle pointed up to be parallel with the top tube when you are dirt jumping and you are grabbing the seat in the air. But I wouldn't do that. Another benefit of the horizontal angle of the seat would be when you are coasting with your butt sideways on the saddle, it would be less likely to slide down towards the rear wheel.

I am surprised you feel that there are too many logos. Those are just what comes originally from all those parts. But I personally like the logos myself. Which part do you feel has too many logos? As for the saddle, I could have a more "traditional" looking saddle. But as a pragmatic person myslelf, I would rather like to use the 130 gram 1 piece carbon saddle that also gets out of way for trials moves. My thought is that the function outweighs the need for looks (though I don't mind the look of the Box one carbon seat) The seat is an interesting issue on trials bikes. We started from mini seats that were shaved to be as light as possible to now people using bigger seats for better "looks". For me, I think the race bmx seat I have is a good middle ground between the trials mini seats of the old, and the full size MTB seats.

I just finished building my Hex! After getting rid of my pogo Echo bike, I wanted to have a second trials bike to complement my Norco Manifesto as I like to have two bikes ready to ride at all times. I have to say, even though there are similarities to my Norco, the two bikes are so different! Going from a suspension fork to a rigid fork is a big change, as well as the Inspired being noticeably steeper in headtube. The build is stock Hex Team Build with Light Bicycle Rims, Vittoria Barzo tires, Box One carbon saddle, Stamp 11 Pedals, and the ODI Longneck grips.

I am looking at upsizing brake rotors from 7 to 8 inch on my Hex. After having extensive experience snapping brake adapters on my previous bike, I want to get an adapter that will last. I can get Hope adapters pretty cheaply where I live. Do Hope adapters have a good reputation? They still look pretty skinny to me.

Good thing i have both of these. These are the comparison shots between the two. According to my scale, the Box one carbon seat weighs 150 grams with the seatpost cut (176 grams out of box) The new E6 Lightweight BMX seat comes in at 114 grams out of box, possibly under 100 grams with the seatpost cut. I would have definitely bought the E6 option had it been available when I was building my first bike. Both are good options. The Box One carbon seat is still a very good lightweight option at 150 grams seatpost cut, just not the lightest.

The lever pumping and the mushy feeling may be by design for its MTB use, but there is no excuse for leaking.

Awesome! I will go with Trial Zones then. With my second bike, it may also be used for occasional MTB riding with a long seatpost, would it be something that could ruin the Trial Zone caliper since it is not designed for that? More specifically the heat generated from a long descent?

I'm going to bump this thread. What are people's opinion on Hope Tech 4 V4, E4, or Trialzone? More specifically modulation I am coming from using Avid BBDBs, Shimano M820 Saints on my street trials bike. While they are awesome for locking and biting, they are hard to modulate, especially for doing something like manuals. I am picking up a Inspired complete with Hope Trial Zone, and I am thinking of switching my Avid BBDB to Hope brakes on my second bike to have easier time doing maintenance with both bikes having Hope brakes. I would be okay giving up on a bit of bite to have more modulation.