Sam Song

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.