James.Parr Posted April 2, 2023 Report Share Posted April 2, 2023 After the rear hub gave up on me on the Barcelona trip I thought it’s time to give her a makeover whilst the rear wheel was getting re built. Weight coming in at about 9.3kg. apart from titanium bolts no where else I’d really want to save much more weight. 11 Quote Link to comment Share on other sites More sharing options...
trialscrab Posted October 9 Report Share Posted October 9 Hey James, can you share what you did to get the weight down on your Hex? Thanks! Quote Link to comment Share on other sites More sharing options...
James.Parr Posted October 10 Author Report Share Posted October 10 On 10/9/2024 at 9:30 PM, trialscrab said: Hey James, can you share what you did to get the weight down on your Hex? Thanks! Pretty standard components . My tensioner is a custom made 3D printed one I created. It was set up tubeless and the tyres helped too! Plastic pedals combined with cranks with an aluminium axle is good. Maguras are really lightweight brakes too. My new set up is heavier but is the best I’ve had so far 2 Quote Link to comment Share on other sites More sharing options...
La Bourde Posted October 10 Report Share Posted October 10 I think the light bicycles rims combined to tubeless billy bonkers saved a lot of weight. The combo seat is also many hundred gramms lighter than a pivotal or tripod one, for only a few bucks. Quote Link to comment Share on other sites More sharing options...
Sam Song Posted October 11 Report Share Posted October 11 20 hours ago, La Bourde said: I think the light bicycles rims combined to tubeless billy bonkers saved a lot of weight. The combo seat is also many hundred gramms lighter than a pivotal or tripod one, for only a few bucks. You will need to install a tubeless insert on the rear with that tire. Otherwise you will be hitting the rim very easily. Quote Link to comment Share on other sites More sharing options...
La Bourde Posted October 11 Report Share Posted October 11 I agree. You can ride with a lot of pressure too. The sidewalls are similar to the previous Schwable Table top, very thin. That's the only way to a get a tire that light. Quote Link to comment Share on other sites More sharing options...
Sam Song Posted October 11 Report Share Posted October 11 (edited) 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. Edited October 11 by Sam Song Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted October 12 Report Share Posted October 12 Would hazard a guess at differences in calibration / accuracy of the two different sets of scales. Quote Link to comment Share on other sites More sharing options...
La Bourde Posted October 12 Report Share Posted October 12 As Sam Song noticed, I think that James's bike weights more than the measured 9,3kg. His scale is surely off. 9,3kg is really light for a street trials. @Sam Song: what about titanium screws? It does not make a huge difference though. Quote Link to comment Share on other sites More sharing options...
Sam Song Posted October 12 Report Share Posted October 12 3 hours ago, La Bourde said: As Sam Song noticed, I think that James's bike weights more than the measured 9,3kg. His scale is surely off. 9,3kg is really light for a street trials. @Sam Song: what about titanium screws? It does not make a huge difference though. 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. Quote Link to comment Share on other sites More sharing options...
SergeL Posted October 12 Report Share Posted October 12 3 hours ago, Sam Song said: 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. How about carbo fork & handlebar? Extention's street fork is available separately AFAIK. Quote Link to comment Share on other sites More sharing options...
Sam Song Posted October 13 Report Share Posted October 13 (edited) 1 hour ago, SergeL said: How about carbo fork & handlebar? Extention's street fork is available separately AFAIK. 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. Edited October 13 by Sam Song Quote Link to comment Share on other sites More sharing options...
Szymon Posted October 14 Report Share Posted October 14 Magura brakes are about 100g lighter then others. Maybe more. Spokes? Double butted + alu nipples = -100g OEM chain tansioner + longer chain is probalby 30g hevier. Quote Link to comment Share on other sites More sharing options...
Ross McArthur Posted October 14 Report Share Posted October 14 On 10/13/2024 at 1:05 AM, Sam Song said: 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. Oh yea, they sound well shady 1 Quote Link to comment Share on other sites More sharing options...
Sam Song Posted October 14 Report Share Posted October 14 4 hours ago, Szymon said: Magura brakes are about 100g lighter then others. Maybe more. Spokes? Double butted + alu nipples = -100g OEM chain tansioner + longer chain is probalby 30g hevier. 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. Quote Link to comment Share on other sites More sharing options...
Szymon Posted October 15 Report Share Posted October 15 (edited) You're right, they weigh similarly. My fourplay weighs 9.15kg. I don't have carbon parts or titanium cranks. Hex on carbon rims may weigh the same. Edited October 15 by Szymon Quote Link to comment Share on other sites More sharing options...
Sam Song Posted October 15 Report Share Posted October 15 (edited) 13 hours ago, Szymon said: You're right, they weigh similarly. My fourplay weighs 9.15kg. I don't have carbon parts or titanium cranks. Hex on carbon rims may weigh the same. 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 Edited October 15 by Sam Song Quote Link to comment Share on other sites More sharing options...
Szymon Posted October 16 Report Share Posted October 16 (edited) Only on the wheels I save 824g: Continental Danny Macaskill 816g Maxxis Rekon 600g Normal tube 220g Tubolito 74g Rubber rim tape 34g Jistsie rim tape 11g Front Hope pro 5 hub 176g Front Inspired hub 153g Reah Hope pro 5 hub with 18t sprocket +/-500g Rear Inspired hub with Trialtech 18t freewheel 469g Edited October 16 by Szymon Quote Link to comment Share on other sites More sharing options...
James.Parr Posted October 20 Author Report Share Posted October 20 (edited) As this as struck up quite the debate I can weigh the new blue setup. It’s had a couple changes so let me weigh it with some digital scales and post a picture of current set up! so since the orange bike I have changed the tyres to maxxis, pedals to hope, brakes to Hope, normal tensioner back on (waiting on a new 3D print for mine), longer stem and deity handlebars so it will be closer to 10kg I imagine now Edited October 20 by James.Parr 1 Quote Link to comment Share on other sites More sharing options...
Swoofty Posted November 11 Report Share Posted November 11 On 10/12/2024 at 5:05 PM, Sam Song said: Their fork will make the head angle a bit steeper and the bike a bit shorter. How would just changing the fork change the head angle? Quote Link to comment Share on other sites More sharing options...
La Bourde Posted November 11 Report Share Posted November 11 Because of the fork height. There might be until 15mm difference or so. The head angle varies from less than 1° max. Quote Link to comment Share on other sites More sharing options...
Swoofty Posted November 12 Report Share Posted November 12 3 hours ago, La Bourde said: Because of the fork height. There might be until 15mm difference or so. The head angle varies from less than 1° max. Ah, got it. Thanks. Quote Link to comment Share on other sites More sharing options...
SergeL Posted November 12 Report Share Posted November 12 13 hours ago, La Bourde said: Because of the fork height. There might be until 15mm difference or so. The head angle varies from less than 1° max. And for those who like to play with numbers, here is a web tool, which calculates bike geometry relations. https://bikegeo.muha.cc Quote Link to comment Share on other sites More sharing options...
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