"Because" -Richard Sachs
My gift is that I am somewhat handy, my curse is that I am somewhat lazy.
Regarding RDs... On my 620 I'm running a 50-45-28 on a 14-28 FW with a 1990-ish Suntour XC Comp. My Voyageur SP was using a 50-46-30 and a 14-28 FW with a Suntour LeTech.
I would guess any post 1984 GS caged Suntour or any long cage Shimano MTB derailleur (MT-60, 62, 730, 732, 735... etc) would work magically.
Maybe this is question that should be in the mechanics area but I just read this from sheldonbrown.com site that has to do with the rear derailleur decision I'm trying to make.
A note about capacity:
Manufacturers have to assume that their customers are clueless, and will expect the chain to have some tension on it even in the bad gears where the chain is using small chainrings with small rear sprockets. Thus, the rated chain-wrap capacity is very conservative. A competent cyclist who uses the gears properly can generally exceed this by several teeth with no problem.
Maybe I can get away with using my derailleur with 34 capacity with a set up that has a total possibility of 37...if I'm careful not to do silly things?
All comments/opinions are welcome Thank you
Yes, for chain wrap that should not be a problem, as most people only use the largest 1/2 of the cogs with the granny.
There's no such thing as a routine repair.
Don't tell me what "should" be - either it is, it isn't, or do something about it.
If you think I'm being blunt take it as a compliment - if I thought you were too weak to handle the truth or a strong opinion I would not bother.
Please take the time to post clearly so we can answer quickly. All lowercase and multiple typos makes for a hard read. Thanks!
I'll be changing the seat and making a few light adjustments but other than that, I'm pretty much finished fixing up NOS. The term will never mean the same thing to me again.
Other than the parts I had planned on changing, I added new cables, wheels, freewheel, and rear derailleur. But the good news is, I'm finished for a while.
For the final hoorah, I'll post some before and afters, and again, thanks to all for all the input and help. You may be able to tell I followed some ideas.
PS... Thank you seller for the before pics.
Trek 1984 620.jpgTrek 1984 620a.jpgTrek 1984 620b.jpgTrek 1984 620c.jpgTrek 1984 620d.jpgTrek 1984 620e.jpgTrek 1984 620g.jpg
t 620 c.jpgt 620 b.jpgT 620 a.jpgt 620 e.jpg
Hey Bruce- That's a beautiful bike.
I know you want to change to a cushy springy seat- but I'd keep a supportive saddle.
Secondly- are the brake levers in a comfortable spot for you? I like having my bars up a little like you have them, but I like having the hood extend out on the same plane as the angle of the bars- yours look like they go up.
Just my personal preference stuff.
It's a fantastic bike- with a whole lot of seriously beautiful componentry on it. Ride it well!!!
Huge experience with the DuoPar..Best shifting rear derailleur if you have a wide spread cog..The only draw back is that it wears out more quickly
From Geneva Illinois
71 Schwinn SuperSport
72 Schwinn Paramount Chrome
73 Schwinn World Voyageur Kool Orange
73 Schwinn World Voyageur Opaque Blue
75 Raleigh Superbe 3speed
81 Schwinn Superior
82 Mercian Strada Speciale
82 Schwinn SuperSport SP
84 Lotus Supreme
85 Basso Loto
88 Ocshner in Chrome
95 (GT)Harley Davidson 4sp cruiser
96 Dynoglide deluxe
11 Specialized Roubaix Elite
I like my hoods to be perpendicular to the angle that my arms come down off of my body so my wrists do not have to twist downwards at my palms and pinch the ulnar nerve in my wrists when gripping the hoods. I have nerve issues with my wrists from years of racing motorcycles off-road and having undiagnosed lyme disease for a number of years which precipitated septic arthritis which presents mostly in my load-bearing joints as well as my wrists. I position my drop-bar brakes up higher than most people do and get a lot of folks comment that my "brake levers are too high." But I don't have them angled quite that much up/back.
'74 Raleigh Carlton Competition w/ Ultegra | '97 Trek 720 Singletrack CX-er w/ 105 | '64 Raleigh LTD-3 modernized w/ all alloy components |'69 Raleigh Twenty | '54 Raleigh Sports
I like Treks a whole lot and they don't get much better than your 620, Bruce. Give that Avocet saddle a chance - You may be pleasantly surprised. (They're well regarded by many riders, and my own experience bears that out).
Thanks all. Appreciate the suggestions and the kind words. The handlebar position is work in process, and they do look pretty high in those pics so some adjustment may be coming. Looking forward to the weather break to really start the season and ride this bike.
auchencrow, thank you. I road on an Avocet for many years, but it was long ago and I don't remember everything but I do remember the "break-in" period. Once I'm broken in, I'll give it a go this coming season.
Speaking of broke, more cash flying away on nos, (and I didn't noticed the front tire issue when it was initially mounted as I only put about 40 psi in them) the replacement tires are 1-1/4", and the tire tip is touching the fork top by 0.00001" or something like that. So to remedy this, I've now have a replacement 1-1/8" tire for the front on order with bells of cha-ching playing in the background.
Anyone else having fork/tire close encounters?
Maybe the tires are just larger/puffier than back in the day?
Regarding your tires- my 78/79 Trek 736 will take Pasela 28s, but not 32s- they drag on the fork crown and brake bridge. I've read that Paselas run large- at least compared to other tires.
I've probably been the one to ***** the loudest about how bad the DuoPar is. My DuoPar on my 620 gave me problems; not little problems- big, unacceptable problems. Since I've gotten my 720, I have not replaced the DuoPar Titanium, based solely on the experience of JohnDThompson. When I have read about people talking about how GOOD and SMOOTH and magical the DuoPar is... My DuoPar Eco is none of those things. However, I've been SHOCKED as to how smooth operating the DuoPar Titanium is. Like seriously not feeling the chain moving. I've used some of what I've seen as the finest regarded derailleurs- this thing is among them. If this is how DuoPars shift- I understand how they're so well regarded. HOWEVER- they do appear to break.