All sounds very interesting... is there anyone who can confirm all this? It would be nice to have everything that has happened out in the open, like Joe says, the trials community has a right to know what's happening regarding the competitions they will be riding in this season!
I'll try and do one this week sometime if I can find my video camera... theres a few differences between how AndyT and myself grind - my way takes off less material and makes the grind sharper (depending on the disc used anyway). Should be able to get some good pics as well
Sorry if I wasn't clear - I meant the extrusion tool made to create the rim section. These are hugely accurate and there is next to no variation (any more than 0.05mm would suprise me) between rims - measure some next time you have a few of the same The only other place it can vary would be if the extrusion is cut to the wrong length, however on a 24" rim, cutting this piece of material long or short by even the massive amount of 5mm would only vary the ERD by 1.525mm! (So 0.75mm on each spoke.) I would estimate rim lengths are cut to within 1mm either way though. I've certainly never been given any problems by not measuring each and every rim I build anyway (Up to 20 in a busy week.)
For 100% accuracy I would agree, but the tooling isn't gonna change so all rims of the same model will have the same cross section - and therefore ERD.
238 drive and 240 non drive should do the job nicely, both 3x That's using the Hopetech calculator dimensions for the hub, 36h, and 498/499 as the ERD.
Is that the one listed on the Sun website? If so, its incorrect. The last pair of Rhyno Lites I built came out to more like 499... (bought spokes for an ERD of 493 and they were miles too short, had to buy more). Gimme a few mins and I'll work out the lengths for you
You *may* be able to get away with a 118mm since I assume you'll be running no bashring on the cranks? My best advice would be to try your 118 and hunt down longer if you need - 122.5mm and 127.5mm should be pretty widely available Adam
A bit of quick maths shows what size rotor you need on a stock for it to be as powerful as a 160 on a mod... I think its about 205. The 200mm Mono Trial I ran on my Simtra was easily up to the job! I'm not going to get into the 'disc debate' in too much detail, except to say I never have to touch my bike before riding it any more, and it never lets me down (when I wouldn't expect it to - obviously hitting the face of a wall when not making an up to back wheel doesn't count!).
Ah yeah, possibly, with a bit of filing... Its to do with where the caliper sits - a #5 caliper and +40 adaptor is certainly much closer to fitting than a #3 with a +20.
Packets, tut! I think it was about 10, spent an hour constantly making, eating, making, eating.... bananas with choc spread, then some lemon and sugar - beast!
It sounds like you were just going so far you couldn't catch up with the freewheel? (Your dad explained you thought the freewheel stopped working when going down hills.) If it works spot on at low speeds then there's nothing to worry about!