Bike Lore

JB you are clearly a very intellectual person and I am not exactly sure what we are disarrange about. but thank you for you input. it has been very insightful and intellectually stimulating. regarding my wheel issue. I have sadly given up on having it rebuild and decided to buy a pre build one. Hope Pro 2 Disc Rear 32h Gun Smoke NoTubes ZTR Arch Disc Rim 32h Black DT Swiss Spokes Competition Stainless DB Black 2mm-1.8mm DT Swiss Nipple Brass Pro-lock Black Set Per Single Wheel Velox Rim Tape Cloth 22mm R2451 including VAT now i need to wait...... time time time thank you everyone for the information and tips.

I hope i can explain this correctly but a bolted assembly works with pre-tension in the bolts. the joints it makes are a preloaded joint and if you pull on the plates that are begin joined you reduce the compression force on that joint between the plates. if you increase the force the load in the joint becomes less and less up to the point where your force is equal to the preloaded force in the bolts. After this the tension in the bolts will start to increase not before. Therefore if you would like to know how strong you need design your bolts you need to know how much preload you put in. if you design force is below the preload force your bolts will never see cycle loads and thus never suffer from fatigue that is the beauty of a bolted assembly.same goes with your wheel the spokes are preloaded but deu to the design you don't need to pre-load the spokes bejond the requierd force. I think we need to agree that we disagree on this. I will run a FEA(finite element analysis) on a wheel and show how the force increase and decrease in the spokes of a rolling wheel. i think the web example is a very valid explanation. but you are correct the spokes can never go in to compression they just loos some of there pre-tension

thank you JB. i think that is the last nail in the 819 coffin. I like your summery of the pre-stress in the spokes. it is 100% correct. same goes for bridges and bolted assembly. it is not an easy concepts to grasp. it helps me to see the wheel as a web where the weight of the rider hangs from the upper spokes and when the tension in the upper spokes increasing they lengthen a very small amount and thus the bottom ones shrinks and lose some of the tension. I like to visualize that the "force" of a landing is conducted around the rim to the top and then flows to the hub, top to center trough all the spokes that are in that direction. it also work to see the spokes as elastic strings if you put for on the rim the center point would move in the opposite direction lenthening the elastics on the one side and shortening the others. that is acutlay what happens and why spokes brake. they get streched to much and ""TING!!!""

well www.williamsbikeshop.co.za was recommended to me by several people. there are others but I was unsure if i would use them

thanks flowta. i will drop him an email. thanks very much

it is times like these that i some times i wish i lived closer to JHB, but then i look up on to the mountains and know where my strength come from. Thank FO I will go look at the rim. seem like allot of people are happy with them

I use to have XT. was under the illusion the where good. but then i got Avid Elixers. and wow!!!

o one more thing that i like about my SJ is that i use an normal bike rack that holds on to the top tube. that saved me from buying a new rack for my car.

Well. I had/have both, a Anthem 1(2008) and Specialized Stumpjumper FSR Comp(2009) . The Anthem got nicked last year the day after ester weekend and i loved the bike . I really enjoyed her . she was about 600g lighter than the SJ and had full XT spec. the suspension was very efficient and my general experience of her was that she was a racer. lean and hard From the insurance money I got my self the SJ and i am in love I feel some what like I am cheating on Foxy, that was what I affectionately called the anthem, she was good for me and did teach me how to treat a bike right but the SJ is so much more fun and lay back. there is no hassles with rocks, big jumps or long hours in the saddle. with Foxy you get your play time and it was fast, fun and exiting but you knew after that it was a bit wild and scary and you felt used. the anthem expects you to know what you are doing. choosing the wrong line and she will let you know not to do it again. with her 100/90mm travel. With my SJ life flows, a race is just one more ride and you don't really have any hassles. one thing about the SJ is that her parts are affordable (SLX) on the high ware items but the stuff that counts are high spec. with her 120mm travel right round and her Fox shocks that has a lock out option for the hard climes. With her excellent Avid Elixir brakes. X9 Derailleur and full cable runs on the sifters there is no issues with mud, dust, gravel or sand. and her lines are hot, smooth like she rides. if i feel sad and depress i go home and go for a ride. The 203mm front disk gives hard braking a new meaning and it looks impressive. http://www.bowcycle.com/bikes/blogs/viks-picks/wp-content/uploads/2009/02/fsr.jpg so it really depends on you. if you like a bike that is extremely efficient and you don't mind taking the punishment for make a mistake then i say go for the Anthem. she is fast and expects you to give it all. time, effort and money. but if you like the easy life, some leeway to make a mistake ,chooses the wrong line and would like to live to tell about it i suggest sj.

yes. i relaise that. I have a reputable wheel builder that has been recommended in mind. live in Stellenbosch. well let see

can i use DT Swiss Revolution Stainless DB Spokes? I ride hard but don't do all mountain even tough I would like to think i do. it states that Revolution is not for heave use but my definition of heave use and theirs could deffer allot

Hay Flowta and Ferrous Oxide . Thanks for confirming that using the same nipples and spokes is a bad idea. I have Shimano M525 SLfor my rear hub and i will use the DT-Swiss spoke calculator to get the spoke lengths when i need to order them.

thanks. I am leaning toward ZTR Arch Disc Rim but still not 100% sure

I managed to bend my rear wheel on my lovely stunt jumper and even tough the heart shape rim looks quite it is not that practical. so I need to replace it. so i have a few question. The rim that i have is a DT-swiss 420SL(420g i think) The bike is about 1 year 3 months old and has done about 6000km that is what my polar claims. I weigh about 92kg fully kitted and like to say that i ride hard but i don't like doing drops or ramps higher than 1 meter. I have 2 ways to go 1. Buy a new wheel (Rim, spokes and hub etc) 2. or only replace the rim, I am concerned that the spokes and nipples could be a issue later. and the last question: what should i go for? Should I go for: NoTubes/Stans ZTR Arch Rim 32H Black (420g) ( I like the sales jargon) Mavic 819 disc (tubeless, 450g) DT-Swiss EX 500 (500g) DT-Swiss XR 400 (400g) a little bid on the light side of life i think. other options are welcome

jip. but mine happened after a hit a tree en bend the shifter. that is why i got the X9 now and the same issue.

Thank MoreTrails. I think i managed to fix it, I loosened the bolt/screw and it works now. one more question that 4 leg star should it move/rotate when i shift? http://www.sram.com/sites/default/files/images/products/shifters/hero_15.jpg

I bought this Sram X9 shifter and I am not sure if it is working correctly. should the shifter not flick back after i push up a gear? my X7 does. is this normal? it seems to get stuck

Yes it does. it does exactly what is should do. it restorers the balance, it makes dummer people poorer and smarter people richer

one more thing: I know some one who was very unlucky. CRC send his stuff in multiple parcels and Customs charged him double VAT. the total amount of the order was was about R5000 and he payed R1400 on VAT. R700 on the one and R700 on the other. and no complaining or begging could convince them. it got to the point where if he did not pay the amount the post office before the next day they where going to return it to CRC. i felt really sorry for him. That is why it is a good idea to make use of a importer or clearing agent.

Well in theory you should only pay 14%(VAT) +R12(Customs handling per parcel) on bike parts. on other items there is duty's. i think in clouting it is 10-25% + VAT. not sure but you get the idea. some times, in very rare and exotic circumstances customs will let the parcel go through without charging VAT or dutys.

https://community.bikehub.co.za/topic/71243-2300-lumens-mtb-lights-new-price-reduced/page__p__1031533#entry1031533 same advert :-)

I find it very funny that Brad from magiclight claim there are fake out there. it is bioned me that someone would go to all the effort of copying a copy. the Mj808 or magic shine 900 unit is a copy of the lupine Tesla, http://www.lupine.de...ghtheads/tesla/ why on earth will someone go to all the effort of copying a copy.... the manufacter does not realy give a dam who they sell it to. anyways I imported a batch of the lights for my self and some friends the rest I am selling of to cover my time and effort. about 1/5 where DOA( Dead on arrival) which i sent back. i tested ever light, battery and charger and added thermal compound to the LED's. Then i washed all the solder paste of the boards and reassembled ever one personally after i inspected the soldering. I am confident that the light that i sell will last. I plan to hold some in stock for a few months after winter if one of the lights failed so that i can swap it out for them. but I don't plan to carry it forever so after October i will sell the warranty ones for about cost. I am going to do the Transbaviaans and made my self and some friends bigger batteries. let me know if you like one aswell.

Jip they are. brand new and the stock is limited so hurry

It will cost R245 including laborer. i think it is worth it

thank. CWC sorted me out.