Go Back  Bike Forums > Bike Forums > Clydesdales/Athenas (200+ lb / 91+ kg)
Reload this Page >

Attention KHS 2014 Flite 747 XXL & XXXL Owners w/ skipping chains- Problem Solved!

Notices
Clydesdales/Athenas (200+ lb / 91+ kg) Looking to lose that spare tire? Ideal weight 200+? Frustrated being a large cyclist in a sport geared for the ultra-light? Learn about the bikes and parts that can take the abuse of a heavier cyclist, how to keep your body going while losing the weight, and get support from others who've been successful.

Attention KHS 2014 Flite 747 XXL & XXXL Owners w/ skipping chains- Problem Solved!

Old 05-20-14, 04:08 PM
  #1  
Junior Member
Thread Starter
 
Join Date: May 2014
Location: Newhall, CA
Posts: 7

Bikes: KHS 747 Flite 67cm XXXL Road 2014, Diamond Back Ascent EX MTB/Commuter 1992

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Attention KHS 2014 Flite 747 XXL & XXXL Owners w/ skipping chains- Problem Solved!

KHS 747 Flite Owners with skipping chain/shifts:

I am seeing other owners of 2014 KHS Flite 747's on this forum complaining of the same "skipping chain/shift" problem I experienced with mine.

I have your solution.

I ordered and picked up my KHS 747 Flite XXXL bike last month and immediately on the first ride the chain skipped mysteriously when giving the extra long 200mm cranks some forward pressure to pedal. I could lightly pedal with no skipping, but any real pressure on the pedal- even moderate- made the chain "skip forward violently". I realized this only happens when on the 52 tooth front big chainring. It never skipped while on the small 36 tooth front inner chainring. My LBS tried all sorts of adjustments to the front and rear derailleurs plus adjusting the barrel adjusters and even tightening the crank arms. It still skipped. We then put another KHS Flite 747 chainring on my bike that was on another new Flite 747 XXL in the showroom- SAME problem- skipping chain.

Here is the defect and the solve: The issue is that the big 52 tooth front chainring KHS installs is far too weak for us Clydesdales-period. When putting pressure to pedal the big chainring "bends" and lets the chain pop off the chainring and jump a tooth- rather violently. My LBS then switched the KHS chainring to a bone stock Shimano 50 tooth big chainring and I had no skipping at all- I could even stand on the cranks with all my weight- perfect!

Here is my permanent solve at my own expense- I bought new forged 52/36 chainrings from Praxis Works (about $165). Forged chainrings are the strongest for us Clydesdales and Praxis is the only (yes only) manufacturer of a 52/36 forged compact 110BCD chainring set in the world- I know because I did many hours of research to find this out! Shimano is the only other maker of forged chainrings in the world, but only makes a 50/34 Ultegra combo, not a 52/36. I installed the Praxis 52/36 forged chainrings on my Flite and it is sheer perfection. The shifts are perfection and I can stand on the cranks and have zero chainring flex. The 50/34 Shimano Ultegra combo will work perfect BTW if you want a setup better for hill climbing- you will just need to have your front derailleur adjusted and moved a little lower on the frame to accommodate the smaller diameter.

So, KHS seems to have sourced very cheap chainrings for these "Clydesdale-specific" bikes. I took it upon myself to fix the issue and don't want to point fingers at them. Heck, I am just glad I was able to find a bike for my 6 foot 8 body! KHS should take note though and just ship these with better chainrings- probably 50/34's as the smaller diameter will be even stronger. Yes, It would be ideal if they installed forged chainrings for us bigger folk, but that would add $100-$150 to the price. As I proved, even a mid-range Shimano 50 tooth stamped chainring was better than the stock KHS chainring.

So, if you bought a 2014 KHS Flite 747- change out the chainrings- both if you can afford a new forged set, but at least replace the 52 tooth stock one with a 50 tooth "standard" chainring. When I had the Shimano 50 tooth and the KHS 36 tooth combination on while waitng for my Praxis chainrings it seemed to shift just fine. If you cant afford that, have your LBS change the 52 tooth to a stronger 50 tooth and have them file a warranty claim with KHS ad they should really cover your switch to a stronger chainring. I am not sure you can find a 52 tooth "stamped/machined" chainring strong enough to handle our weight as the extra diameter is what may be causing the flex. If you want to stick with the 52/36 stock setup like I did go with the forged 52/36 Praxis forged- they are strong and don't bend! This is NOT a commercial for Praxis- frankly I wish I did NOT have to spend my money to fix KHS's problem, but i wanted you all to know how I got my Flite shifting perfectly!

Problem Solved!

Good Luck All!

Last edited by svosho; 05-21-14 at 04:12 PM.
svosho is offline  
Old 05-22-14, 10:21 PM
  #2  
Thread Killer
 
Join Date: Aug 2008
Location: Ann Arbor, MI
Posts: 12,367

Bikes: 15 Kinesis Racelight 4S, 76 Motebecane Gran Jubilée, 17 Dedacciai Gladiatore2, 12 Breezer Venturi, 09 Dahon Mariner, 12 Mercier Nano, 95 DeKerf Team SL, 19 Tern Rally, 21 Breezer Doppler Cafe+, 19 T-Lab X3, 91 Serotta CII

Mentioned: 30 Post(s)
Tagged: 0 Thread(s)
Quoted: 3071 Post(s)
Liked 1,624 Times in 999 Posts
chaadster is offline  
Old 06-12-14, 03:29 PM
  #3  
WEK
Senior Member
 
WEK's Avatar
 
Join Date: Feb 2013
Location: Utah
Posts: 144

Bikes: 2014 KHS Flite 747

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 8 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Did you mount and install the rings yourself, or have the LBS do it? And if you didn't do it yourself, do you think you could have?
WEK is offline  
Old 06-28-14, 10:34 PM
  #4  
Senior Member
 
H.S.Clydesdale's Avatar
 
Join Date: Jul 2012
Location: Lakewood, CO
Posts: 152

Bikes: 2013 KHS 747 (by Lennard Zinn), 1987 Nishiki Sport, 1983 Sanwa 700

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 3 Times in 1 Post
Thank You!!

I am having this exact problem. I had been fiddling with my derailleur adjustments to no avail. I finally gave up and figured it was due to flexing of the frame. I had been researching carbon fibre thinking I needed a stiffer bottom bracket to accommodate the increased torque of the longer cranks. But this is way better! Cant wait to ride on the new chainring, as the bike is wonderful except that I can never really stand on it with my full force.

Any advice on where to buy these? I checked my usual spots and these chainrings seem to be hard to find.

Last edited by H.S.Clydesdale; 06-28-14 at 11:04 PM.
H.S.Clydesdale is offline  
Old 07-03-14, 01:09 PM
  #5  
WEK
Senior Member
 
WEK's Avatar
 
Join Date: Feb 2013
Location: Utah
Posts: 144

Bikes: 2014 KHS Flite 747

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 8 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by H.S.Clydesdale
Thank You!!

I am having this exact problem. I had been fiddling with my derailleur adjustments to no avail. I finally gave up and figured it was due to flexing of the frame. I had been researching carbon fibre thinking I needed a stiffer bottom bracket to accommodate the increased torque of the longer cranks. But this is way better! Cant wait to ride on the new chainring, as the bike is wonderful except that I can never really stand on it with my full force.

Any advice on where to buy these? I checked my usual spots and these chainrings seem to be hard to find.
Unfortunately (or fortunately, depending on how mechanically inclined you are) I've only been able to find them direct from Praxis online.
WEK is offline  
Old 07-04-14, 01:10 PM
  #6  
Senior Member
 
H.S.Clydesdale's Avatar
 
Join Date: Jul 2012
Location: Lakewood, CO
Posts: 152

Bikes: 2013 KHS 747 (by Lennard Zinn), 1987 Nishiki Sport, 1983 Sanwa 700

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 3 Times in 1 Post
Yeess. Found a 52/36 set on ebay for $140.



Just took it for a quick test ride, but so far it feels amazingly better. MUCH stiffer. Good thing I did not require a carbon fiber bike.

Interestingly, My bike had a 50/34 ring on it. Mine was a 2013 model. This required a more complicated install, but overall just took about 40 minutes. Well worth it, as now that I will be spending more time out of the saddle, I will enjoy the longer gears.
H.S.Clydesdale is offline  
Old 10-14-14, 09:06 PM
  #7  
Newbie
 
Join Date: Oct 2014
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Glad to find this thread. Got my XXL 747 home (bought in California, live in Utah) and had this issue immediately, doesn't even take much force to make it skip on (or completely off) the large chainring. Talked to KHS directly myself after getting an unsatisfactory answer through the dealer... was told there's been an issue with some chainrings. Not even sure it's worth trying to get fixed by them now, not sure I can trust this one anymore even if I get one that seems to work... I'll just order the strongest available. Gotta say, this is really surprising/disappointing for a bike made for big/tall folks. Thanks for the info svosho.

Here's a slow-mo video of the skipping (first clip) and jumping off (all the rest) that I took to send to dealer/KHS:

update
Getting a new chainring from KHS, the employee I talked to said they'd only seen or heard of this 3 or 4 times before, said 99.9% sure this would fix it. I'll try it out, but I also ordered the Praxis set, I'll probably end up using it just for sake of confidence.

Last edited by codysims; 10-16-14 at 10:41 AM.
codysims is offline  
Old 10-16-14, 09:47 AM
  #8  
Senior Member
 
fatpunk's Avatar
 
Join Date: Mar 2012
Location: Moncks Corner, South Carolina
Posts: 117

Bikes: '12 Giant Sedona, '15 Specialized Crave

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Wow, good to know. Thanks for the heads up, the 747 has been on my list for a few years now.
fatpunk is offline  
Old 10-16-14, 03:23 PM
  #9  
WEK
Senior Member
 
WEK's Avatar
 
Join Date: Feb 2013
Location: Utah
Posts: 144

Bikes: 2014 KHS Flite 747

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 8 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by codysims
Glad to find this thread. Got my XXL 747 home (bought in California, live in Utah)
Someone else in Utah has a 747? We must ride!
WEK is offline  
Old 10-16-14, 08:55 PM
  #10  
Newbie
 
Join Date: Oct 2014
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by WEK
Someone else in Utah has a 747? We must ride!
Nice, let's do it! I'm in Sandy. My username is also my twitter.

Props to KHS for getting me the new chainring via next-day-air. I was expecting an identical replacement and that's why I was apprehensive, but it's a different model - thicker & heavier.. and it solves the problem! So if you encounter this, hit them up for a replacement straightaway. I'm undecided if I'll use the Praxis set I ordered even though this one seems to work...
Attached Images
File Type: jpg
20141016-DSC04862.jpg (100.8 KB, 42 views)

Last edited by codysims; 10-16-14 at 10:51 PM.
codysims is offline  
Old 10-17-14, 10:27 AM
  #11  
WEK
Senior Member
 
WEK's Avatar
 
Join Date: Feb 2013
Location: Utah
Posts: 144

Bikes: 2014 KHS Flite 747

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 8 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by codysims
Nice, let's do it! I'm in Sandy. My username is also my twitter.
Ha! So am I. Where do you like to ride? Not on twitter. Go ahead and send me a PM.
WEK is offline  
Old 10-17-14, 11:06 AM
  #12  
Newbie
 
Join Date: Oct 2014
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by WEK
Ha! So am I. Where do you like to ride? Not on twitter. Go ahead and send me a PM.
50 posts to PM (wow, restrictive)... username is also at gmail
codysims is offline  
Old 10-17-14, 11:32 AM
  #13  
WEK
Senior Member
 
WEK's Avatar
 
Join Date: Feb 2013
Location: Utah
Posts: 144

Bikes: 2014 KHS Flite 747

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 8 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by codysims
50 posts to PM (wow, restrictive)... username is also at gmail
Didn't realize that. Email sent.
WEK is offline  
Old 01-29-15, 10:08 AM
  #14  
Senior Member
 
Join Date: Apr 2014
Location: Abbotsford BC
Posts: 205

Bikes: Some old CL beater

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 40 Post(s)
Liked 12 Times in 7 Posts
Can anyone tell me the largest tire size that will fit on the 747? Also, are there any fender/rack braze ons?
thanks
XXLHardrock is offline  
Old 02-03-15, 12:07 PM
  #15  
Senior Member
 
H.S.Clydesdale's Avatar
 
Join Date: Jul 2012
Location: Lakewood, CO
Posts: 152

Bikes: 2013 KHS 747 (by Lennard Zinn), 1987 Nishiki Sport, 1983 Sanwa 700

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 3 Times in 1 Post
Originally Posted by XXLHardrock
Can anyone tell me the largest tire size that will fit on the 747? Also, are there any fender/rack braze ons?
thanks
28c is the largest tire. 32c will clear in the width, but they will be too tall, and scrape the brake. You can see some detail pics of my rear 28c tire in this post:

https://www.bikeforums.net/commuting/...l#post17517040

You can also see the rear braze ons. They exist on rear dropout, but nothing on the rear stays. I dont think there are any on the front fork.
H.S.Clydesdale is offline  
Old 11-18-15, 01:07 PM
  #16  
Newbie
 
Join Date: Nov 2015
Posts: 3

Bikes: 1987 Cannondale ST400 27", 2012 Trek Mamba 23" 29er

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Well, I'm properly stoked to find people enjoying their Flite 747's. I'm new to to forum & have been searching for a stock tall bike for some time, as I'm 6'8" and am riding an aluminum 27" 1987 frame from Cannondale. It has the same chain skip issue as this, so I'll look at that next, but I'm stoked to have found a replacement stock bike in my size
Cyclone_TS is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
hazben1
Bicycle Mechanics
7
01-04-16 04:02 PM
TallRider
Bicycle Mechanics
17
02-05-14 12:08 AM
nubike
Bicycle Mechanics
15
02-11-11 11:30 AM
Scheherezade
Bicycle Mechanics
6
10-13-10 04:47 PM

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.