Go Back  Bike Forums > Bike Forums > Classic & Vintage
Reload this Page >

PKN-10 + questions about new cranks/tires.

Notices
Classic & Vintage This forum is to discuss the many aspects of classic and vintage bicycles, including musclebikes, lightweights, middleweights, hi-wheelers, bone-shakers, safety bikes and much more.

PKN-10 + questions about new cranks/tires.

Old 07-14-14, 10:31 AM
  #1  
Mycophiles
Junior Member
Thread Starter
 
Join Date: Jun 2007
Posts: 12
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
PKN-10 + questions about new cranks/tires.

I've been riding my PKN-10 a bit more. I've gone through and adjusted the derailers so that they shift correctly.. from top-bottom. But I've noticed that if I put heavy torque on the crank the chain pops off. Also, I've noticed that the rear derailer arm has a bit of play from left to right.

If I crank backwards on the bike I've the chain will hang for a second at one spot so I'm guessing I prob. need to get a new chain, but would this fix the issue with the skipping/popping down the gears when high torque is put on?

Does anyone know a decently priced set of tires/wheels that would go on this bike? Also, does anyone know a decent handle-bar setup for this bike?

I have so many questions guys.. sorry. But for now.. the chain popping is my priority.

Thanks
Mycophiles is offline  
Old 07-14-14, 10:46 AM
  #2  
Chombi
Senior Member
 
Chombi's Avatar
 
Join Date: Jul 2009
Posts: 11,139

Bikes: 1986 Alan Record Carbonio, 1985 Vitus Plus Carbone 7, 1984 Peugeot PSV, 1972 Line Seeker, 1986(est.) Medici Aerodynamic (Project), 1985(est.) Peugeot PY10FC

Mentioned: 21 Post(s)
Tagged: 0 Thread(s)
Quoted: 140 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
If the chain isn, t stretched out or worn, it could actually be just a stiff link on the chain a few minutes of adjusting the link with the chain tool should fix it if it is indeed a stiff link. It's a good excuse to throughout clean the chain while you have the chain tool handy to take it off and back on the bike.....
Another thing you might check is if the tension spring at the lower pivot is providing enough tension on the chain so that it keeps the chain from rolling on to itself when you stop pedaling and freewheeling...
If the derailleur has too much slop/ play at the pivots, it might be time to replace it as it might also be contributing to your chain problems...

Last edited by Chombi; 07-14-14 at 10:49 AM.
Chombi is offline  
Old 07-14-14, 10:59 AM
  #3  
Mycophiles
Junior Member
Thread Starter
 
Join Date: Jun 2007
Posts: 12
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
The chain does seem to have a lot of play. I can fold it back on itself a couple links when in the highest gear. I've looked to see if I can adjust the chain tension but don't see how. I know the spring you are talking about but I didn't know It could be adjusted. The slop in the rear derailer is about 2.5-3mm I would guess.
Mycophiles is offline  
Old 07-14-14, 11:25 AM
  #4  
Chombi
Senior Member
 
Chombi's Avatar
 
Join Date: Jul 2009
Posts: 11,139

Bikes: 1986 Alan Record Carbonio, 1985 Vitus Plus Carbone 7, 1984 Peugeot PSV, 1972 Line Seeker, 1986(est.) Medici Aerodynamic (Project), 1985(est.) Peugeot PY10FC

Mentioned: 21 Post(s)
Tagged: 0 Thread(s)
Quoted: 140 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Some derailleur tension springs can be adjusted if the maker provided additional slots or holes for the spring ends to go into, but some don't provide such, so when the spring wears out and do not provide good tension anymore, you will either have to change out the spring, or the whole derailleur if you cannot find a replacement spring anymore. Getting at the spring is easy on most rear derailleurs. You usually just grip on to te derailleur pulley cage assembly, and unscrew the lower pivot bolt attached to it on the other side of the derailleur, usually by using a proper sized Allen wrench or a close ended box wrench it the derailleur has a hex head for lower pivot bolt. Just keep track of the sequence the parts go together and remember how much pre-tension is set on the spring by the way the spring ends go into notches or holes in the pivot assembly.....
BTW, 2 - 3 mm of lateral slop I quite excessive I think you need to consider replacing the derailleur, especially if it happens to be one of those Simplex derailleurs with a lot of plastic parts on it.....
A few detailed.pics of your drivetrain can help us further to give you a diagnosis of what's happening with your bike......

Last edited by Chombi; 07-14-14 at 11:31 AM.
Chombi is offline  
Old 07-14-14, 12:11 PM
  #5  
Mycophiles
Junior Member
Thread Starter
 
Join Date: Jun 2007
Posts: 12
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
One I already had. Going to take some more now.


Ok, here's more.






Last edited by Mycophiles; 07-14-14 at 12:21 PM.
Mycophiles is offline  
Old 07-14-14, 12:26 PM
  #6  
Mycophiles
Junior Member
Thread Starter
 
Join Date: Jun 2007
Posts: 12
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Wait, I didn't see that screw in the second picture. That looks like it would tighten the spring.
Mycophiles is offline  
Old 07-14-14, 02:42 PM
  #7  
Chombi
Senior Member
 
Chombi's Avatar
 
Join Date: Jul 2009
Posts: 11,139

Bikes: 1986 Alan Record Carbonio, 1985 Vitus Plus Carbone 7, 1984 Peugeot PSV, 1972 Line Seeker, 1986(est.) Medici Aerodynamic (Project), 1985(est.) Peugeot PY10FC

Mentioned: 21 Post(s)
Tagged: 0 Thread(s)
Quoted: 140 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
That's a Simplex SX410 rear derailleur.... A lower (budget) model in Simplex's model line at that time.
Considering how old it is, it does not look that bad, but there could be wear at the pivots that you cannot see from the outside.
This derailleur uses Delrin plastic derailleur arms wrapped in chromed sheet steel. A big improvement from the all plastic derailleurs that Simplex had previous to this one, but it could still mean the pivot at at the arms could still wear quicker than if it had all aluminum arms instead. Thus maybe why you have a lot of slop on the derailleur. Do check your derailleur closely to see where exactly the slop is coming from. If it is mostly coming from the top or lower pivot, you might still be able to take some of the looseness away by installing the correct size, thin brass washer shims. Not easy to find, but you might still be able to get them from older bike shops.
You can't really repair these derailleurs, once the pivots at the arms get loose, but you can replace it with one in better or new condition....or even just go ahead and replace it with a much better performing Simplex SX610, which was the successor to this derailleur. although it has the same arm construction as the SX410, the SX610 benefits from an offset top pivot design that places the top jockey pulley closer to the rear cogs, which results to quicker and more precise shifts. You can still find the SX610s being sold at eBay quite easily and they are usually reasonably priced. Trick is, to get one in the best condition you can find so it would not have the same looseness/slop problems that your present SX410 has.
Here's a Spidel branded version of the SX610. The asking price is a bit high becuase of I suspect, the Spidel branding, but most Simplex branded versions sell for less (about 40 - 45 bucks or less, depending on condition).
http://www.ebay.com/itm/Vintage-SPID...item3a937ea859

Last edited by Chombi; 07-14-14 at 03:02 PM.
Chombi is offline  
Old 07-14-14, 03:55 PM
  #8  
Mycophiles
Junior Member
Thread Starter
 
Join Date: Jun 2007
Posts: 12
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Thanks for the help Chombi. I'm going to try to tighten that spring this evening and I'll look at the new derailleurs. Do you have any suggestions on tires/wheel combo? The tires that are on the bike are so old they are starting to fray. The tires are not too bad so maybe I could have them trued or do it myself. Also (if you have a moment) do you have any suggestions on new handlbars or at least new handlbar wraps. I'd like handlebars with brakes on the top part of the bar also...
Mycophiles is offline  
Old 07-14-14, 04:10 PM
  #9  
avzay66
Senior Member
 
Join Date: Feb 2003
Location: Somewhere
Posts: 117

Bikes: Fuji Giant

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I replaced the simplex drivetrain with Suntour Cyclone Mark 2 on my PKN-10. Saved a ton of weight and it shifts way nicer.

as for wheels, the sun M13 rims look right on these vintage bikes. Can be had for around $100 from velomine, although the quality of the hubs
is a bit suspect. Personally, I installed a set of Wolbers on 80s Shimano 105 hubs on my PKN. They seem to work great.

Sun M13 Silver 36h 126mm fits 5 6 7 speed Vintage Road Bikes [072774731008] - $109.00 Velomine.com : Worldwide Bicycle Shop, fixed gear track bike wheelsets campagnolo super record vintage bike
avzay66 is offline  
Old 07-14-14, 04:10 PM
  #10  
John E
feros ferio
 
John E's Avatar
 
Join Date: Jul 2000
Location: www.ci.encinitas.ca.us
Posts: 19,578

Bikes: 1959 & 1960 Capo; 1982 Bianchi; 1988 Schwinn KOM-10;

Mentioned: 33 Post(s)
Tagged: 0 Thread(s)
Quoted: 740 Post(s)
Liked 70 Times in 60 Posts
Measure the length of 24 half-links. If this exceeds 12 - 1/16", replace the chain.
__________________
"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324
Capo: 1960 Sieger (2), S/N 42624, 42597
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
John E is offline  
Old 07-14-14, 06:02 PM
  #11  
Grand Bois
Senior Member
 
Grand Bois's Avatar
 
Join Date: Mar 2005
Location: Pinole, CA, USA
Posts: 17,416
Mentioned: 23 Post(s)
Tagged: 0 Thread(s)
Quoted: 431 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Those later Simplex dropouts have a Campagnolo-style hanger, so you can use most any derailer that strikes your fancy.
Grand Bois is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
spectastic
Bicycle Mechanics
9
05-13-15 05:29 PM
jambon
Bicycle Mechanics
51
11-13-14 06:15 AM
SteelCan
Bicycle Mechanics
13
11-12-13 12:30 AM
FastJake
Bicycle Mechanics
9
05-11-11 08:18 AM
wunderkind
Bicycle Mechanics
14
06-15-10 09:38 AM

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

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.