Rear wheel lockup n stuff
itboffin
Posts: 20,050
This Saturday I did the unthinkable at took my Cervelo off the living room wall and rode it ....outside! :shock:
All good aside from a couple of issues the worst being every time I applied the brakes even gently the wheels locked solid, calipers aren't sticking they just seem to stop dead, the rear being far worse, its very unnerving to be descending 20% and in fear of running off a corner or throwing yourself over the bars.
Why is that? This is the only bike I have with Chorus brakes swissstop pads.
The other issues which i' not sure if related was the rear wheel sliding out i.e. skidding when braking on those descents, i'm guessing I was at that point being too careful but again made for a shite ride.
Finally my shifting has always been rubbish on that bike, front shifting sounds like a steel bar thrown down a lift shaft, well I get to the bottom of another long descent and there's a horrible crunch, I pull over look down at the cranks and see a bolt almost falling out, then i look at the rest which are the same, not even finger tight. This bike has covered no more than 300 miles including 60 on Sat. the only bit I didnt build was the BB install, cranks and chainrings, that was the handy work of a specialist Cervelo LBS in Salisbury, needless to say I pissed at them for this shoddy work and me for now noticing beforehand.
I take that last issue as a lesson learnt, but why is my braking so aggressive?
All good aside from a couple of issues the worst being every time I applied the brakes even gently the wheels locked solid, calipers aren't sticking they just seem to stop dead, the rear being far worse, its very unnerving to be descending 20% and in fear of running off a corner or throwing yourself over the bars.
Why is that? This is the only bike I have with Chorus brakes swissstop pads.
The other issues which i' not sure if related was the rear wheel sliding out i.e. skidding when braking on those descents, i'm guessing I was at that point being too careful but again made for a shite ride.
Finally my shifting has always been rubbish on that bike, front shifting sounds like a steel bar thrown down a lift shaft, well I get to the bottom of another long descent and there's a horrible crunch, I pull over look down at the cranks and see a bolt almost falling out, then i look at the rest which are the same, not even finger tight. This bike has covered no more than 300 miles including 60 on Sat. the only bit I didnt build was the BB install, cranks and chainrings, that was the handy work of a specialist Cervelo LBS in Salisbury, needless to say I pissed at them for this shoddy work and me for now noticing beforehand.
I take that last issue as a lesson learnt, but why is my braking so aggressive?
Rule #5 // Harden The censored Up.
Rule #9 // If you are out riding in bad weather, it means you are a badass. Period.
Rule #12 // The correct number of bikes to own is n+1.
Rule #42 // A bike race shall never be preceded with a swim and/or followed by a run.
Rule #9 // If you are out riding in bad weather, it means you are a badass. Period.
Rule #12 // The correct number of bikes to own is n+1.
Rule #42 // A bike race shall never be preceded with a swim and/or followed by a run.
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I really think something isnt right
Rule #9 // If you are out riding in bad weather, it means you are a badass. Period.
Rule #12 // The correct number of bikes to own is n+1.
Rule #42 // A bike race shall never be preceded with a swim and/or followed by a run.
It sounds like they are snatching - can happen if the pad material isn't right. They aren't designed for carbon rims or something are they?
On my deceased Giant, the stem and bars put my hands well past the front axle and the wheelbase was quite short, which meant a very forward weight distribution. Steep descents required hanging off the back at full stretch to avoid lifting the back wheel.
One other thought: there isn't some sort of nick in the rim that is catching on the pads, causing it to lock when the weight is off it?
Pinnacle Monzonite
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nothing i can tell wrong with the rims, i will double check the pads just incase they shipped with the wrong type
Rule #9 // If you are out riding in bad weather, it means you are a badass. Period.
Rule #12 // The correct number of bikes to own is n+1.
Rule #42 // A bike race shall never be preceded with a swim and/or followed by a run.
If you have some alternative pads to try, that would be my first option. If that doesn't sort it, you know there's something more fundamental wrong.
Rule #9 // If you are out riding in bad weather, it means you are a badass. Period.
Rule #12 // The correct number of bikes to own is n+1.
Rule #42 // A bike race shall never be preceded with a swim and/or followed by a run.
Bikes: Donhou DSS4 Custom | Condor Italia RC | Gios Megalite | Dolan Preffisio | Giant Bowery '76
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yeah seems so the combo of BST that stans have means the stresses on the rim with various tyre types and pressures is something of an art form.
that explains why my original challenge tyres blew off scaring the b Jesus out of me and could have been a very nasty accident.
these will be going tubeless low pressure setup asap, i have a set of superstar ultra 30 with schwable ones at the ready.
i guess the whole early inbetween tubeless ready road market was very inbetween in terms of compatibility.
there's an important lesson here, listen to what your bike is saying when you ride or be ready to spend big on dental care.
Rule #9 // If you are out riding in bad weather, it means you are a badass. Period.
Rule #12 // The correct number of bikes to own is n+1.
Rule #42 // A bike race shall never be preceded with a swim and/or followed by a run.
rim stops at the same point each time, so which spokes do i turn? its pulled towards in that photo
Rule #9 // If you are out riding in bad weather, it means you are a badass. Period.
Rule #12 // The correct number of bikes to own is n+1.
Rule #42 // A bike race shall never be preceded with a swim and/or followed by a run.
None, it's the nipples you adjust.
If the rim is off to the right then you tighten the spokes that go to the left of the hub. Look at the area of the rim that is out of true and see how many spokes it covers and adjust those but only by 1/4 turns. Be careful though, it is easy to make matters a lot worse.
I would be surprised if this is your problem though.
In addition to Cougies comment above - overshoot slightly on each adjustment and wind back a fraction; otherwise you tend to impart a twist on the spoke. Though the threads should be less sticky than most due to being in pristine, brand new condition!
yes its dual pivot in fact before i switched to chrous i have those super light Ti jobs on there which worked perfectly with the swissstop pads, i might have to put those back on
Rule #9 // If you are out riding in bad weather, it means you are a badass. Period.
Rule #12 // The correct number of bikes to own is n+1.
Rule #42 // A bike race shall never be preceded with a swim and/or followed by a run.
https://youtu.be/R0bELYXNI88