Go Back  Bike Forums > Bike Forums > General Cycling Discussion
Reload this Page >

Selling a bike: Mechanical Issue on Test Ride

Notices
General Cycling Discussion Have a cycling related question or comment that doesn't fit in one of the other specialty forums? Drop on in and post in here! When possible, please select the forum above that most fits your post!

Selling a bike: Mechanical Issue on Test Ride

Old 06-18-21, 11:17 PM
  #1  
oberwl
Junior Member
Thread Starter
 
Join Date: Jul 2017
Location: Sonoma
Posts: 17

Bikes: Custom Ti Gravel Self built Force AXS 1 X 12, Allied Cycle Works All Disc Force AXS DT Swiss 1400 Spine, Santa Cruz CC XTR

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
Selling a bike: Mechanical Issue on Test Ride

Just curious: What's your take?
Posted my old road bike for sale. Haven't ridden it in around 6-9 months. It may be a bit dusty, but after airing up the tires and going around the block it seemed fine.
So the buyer arrives. Says he's not familiar with SRAM Double Tap. I show him how it works.

He goes off on test ride. Comes back says the rear derailleur not shifting down. I notice he Cross chained big to big 50-28.
So I try to shift it down, jump on the bike to see what's going on. Yep not working.

I remove the chain & pull off the rear derailleur. The internal spring that pulls the jockey wheels into the body is broken. One side of the spring has come disengaged.

So Question, Is this a rider error, or Worn Part?

I know that the bike should be able to cross chain in the stand, but kind of expected that something is going to go wrong when ridden with force.
BTW: I live on a slight grade, so going up there would be more force than just on even pavement
oberwl is offline  
Old 06-19-21, 05:27 AM
  #2  
dsaul
Senior Member
 
Join Date: Jan 2013
Location: South Jersey
Posts: 2,067
Mentioned: 17 Post(s)
Tagged: 0 Thread(s)
Quoted: 631 Post(s)
Liked 579 Times in 362 Posts
A properly set up drivetrain should be able to use the big/big combo without causing damage to the derailleur. I have used that combo many times on my SRAM equipped bikes with no problem. If the derailleur broke from shifting into that combo, under load or not, the chain was too short. "Cross Chaining" is not ideal, but its not the "end of the world" that people preach on these forums and shouldn't cause anything more than some additional drag and noise.
dsaul is offline  
Old 06-20-21, 09:10 PM
  #3  
SurferRosa
Señor Member
 
SurferRosa's Avatar
 
Join Date: Dec 2018
Location: Pac NW
Posts: 5,526

Bikes: Old school lightweights

Mentioned: 71 Post(s)
Tagged: 0 Thread(s)
Quoted: 2289 Post(s)
Liked 2,942 Times in 1,600 Posts
I've sold a lot of bikes and had a couple mechanicals during a customer's test ride. But I've never seen them shift into the big/big to cause an issue. I do sometimes tell them after the sale to avoid the big/big and small/small. My old bikes aren't intended for that.

I wouldn't worry too much about fault. Just fix it and move on.
SurferRosa is offline  
Old 06-21-21, 06:06 AM
  #4  
Phil_gretz
Zip tie Karen
 
Phil_gretz's Avatar
 
Join Date: Aug 2009
Location: Fair Oaks Ranch, TX
Posts: 7,003

Bikes: '13 Motobecane Fantom29 HT, '16 Motobecane Turino Pro Disc, '16 Motobecane Gran Premio Elite, '18 Velobuild VB-R-022, '21 Tsunami SNM-100

Mentioned: 25 Post(s)
Tagged: 0 Thread(s)
Quoted: 1459 Post(s)
Liked 1,532 Times in 801 Posts
Most failures that occur during the test ride will be your responsibility to repair. Even if the rider crashes the bike, unless you can prove that the rider behaved negligently or dangerously.

Like SurferRosa said, I've sold many bikes that have had mechanical issues even after I had thoroughly rebuilt them and test ridden them. That's why I've learned to do several stressing test rides to see if I can force a failure before a buyer sees the bike. The most common piece out of adjustment will be bottom bracket bearings. Sometimes it takes a few iterations for the bearing compression to be "just right". Second most common might be headset bearing adjustment.

Like the OP, I have had a derailleur return spring fail during a test ride. I replaced the derailleur on the spot to complete the sale, but that was made possible by having a box of spares that would be suitable. Not easy in the OP's case. I also had a buyer discover a small sidewall cut in a Panaracer Pasela gumwall that I had ridden maybe 200 miles. Ugh. I replaced that tire on the spot for him. Stuff happens.
Phil_gretz is offline  
Old 06-21-21, 07:51 AM
  #5  
msu2001la
Senior Member
 
msu2001la's Avatar
 
Join Date: Mar 2006
Location: Midwest
Posts: 1,943
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 905 Post(s)
Liked 878 Times in 505 Posts
I would definitely run a 2x drivetrain through all possible gear combos on a test ride. Cross-chaining causes increased wear, but it shouldn't cause parts in the drivetrain to immediately fail.
msu2001la is offline  
Old 06-21-21, 07:55 AM
  #6  
ClydeClydeson
Senior Member
 
Join Date: Mar 2019
Posts: 1,259
Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
Quoted: 438 Post(s)
Liked 646 Times in 378 Posts
If big-big X-chaining causes damage, that's assembly error.
ClydeClydeson is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright © 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.