JPZ66

Hi all,

Looking for some advice on a nice crankset and proper ring for an IGH project.

The frame is a Peugeot Mixte, for my wife, and will be running either a 5 speed Or 8 speed SA IGH hub w/ drum brake.

Prefer something like Stronglight or TA for this. What would the best tooth count be ? Will be used in a hilly riding environment, so I want to make the climbing easy.


Thanks,

Joe

Grand Bois

The SA 8 speed has a first gear ratio of 1:1, so it will require a ridiculously small chainring. It was designed for bikes with 20" wheels. I use a 42t ring and a 22t cog on my 5 speed and it's hilly here.

rhm

If you're going to be buying a crank for this project, I'd get one of the ones that's sold for single speeds. There are a lot of them, from brands like Origin 8 and the like. A chain ring in the 42T - 46T range is normal. Alternately you can get just a chain ring for 110, 130, or 144 bcd cranks somewhat cheaper.

As Grand Bois said, the Sturmey Archer 8 speed hub is geared differently from other IGH's and on a bike with normal sized wheels you'll want a very small chain ring, which will look strange. The strange look is the only downside; but it's a deal breaker for many. If you want to go for a more traditional look, I like the Sturmey Archer 5 speed hubs, though an old 3 speed is plenty versatile for most riding.

Velognome 

+1 Go with the 5spd and 42 as GB points out. I've been looking and thinking about the Patterson transmission for a combined 10spd set up but the looks of the crank just kinda kill the idea. SA makes a nice looking crank if you want new.

ColonelJLloyd 

I built my mom a bike around a Peugeot mixte with the SRF-5 (or whatever it's called). I used a Stronglight 93 with 42t ring and a 23t cog. It's working out pretty well. No pics handy at the moment.

JPZ66

Thanks guys !

Yes, I'm leaning toward the 5 speed ( X-RD5 ?) with the drum set up. I like the more classic look too, which is why I was thinking of using one of the cranksets I mentioned. Front hub, is X-FDD, front drum / dynohub.

That should be doable with 42 and either 22 or 23 cog.

And I forgot to mention wheels. Yes, I have Sun CR18 rims in 26"(new) or any number of 700c rims in either tubular or clincher. I may actually use the 26" Sun rims for this.

Joe

puchfinnland

from the land of IGH's that sounds about correct,

I set a 8 up for my wife and I found the 8th is rarely used, I should add a tooth in the rear.

lostarchitect 

I have one of these on my 5-speed IGH setup:


Looks and works great. They sell chainrings also.

https://store.electrabike.com/eSource..._/_750024.aspx

JPZ66

AHH!! I like that...that's pretty sweet. Stainless cr bolts too !

-Joe

ColonelJLloyd 

Unless you ride almost exclusively in the wet and rain the only thing you're really gaining by using drum brakes is weight.

Wait? You haven't decided on a wheel size yet? You should do that before asking about gearing. For what it's worth I used 700x35 tires on my mom's Pug and it had more than enough clearance for fenders. ISO 559 wheels are going to lower your BB considerably.

canyoneagle

For retro-look and new design, I've used both of these, and liked them:

- https://www.interlocracing.com/cranks.html
- https://www.fullspeedahead.com/products/109/FGimondi

ColonelJLloyd 

Found the pics. I've since replaced that headlight with a Lumotec Classic.

canyoneagle

That is stunning. U-08?

ColonelJLloyd 

1975 UO-18, I think.

JPZ66

Col,

Yeah I know I should settle on the wheel dia before anything in the gearing, but wanted to see what advice and combos came up in the replies. I know if using those Sun rims, bb will be lower, but I'll likely look for the 165mm arms either way, so figured that'd be ok. I also know the rim dia will affect the overall ratio, but does it affect it that much ? Also, yes to wet weather riding, not to mention a bit cleaner look overall without any sort of external brakes (besides the levers). Another factor is lower maint./ cleaning time.

Other bits lined up for this build are Nitto Northroads bar, although I do not know what stem yet, a VO headset that I have heard good things from the forum about, and some hammered fenders. I want to keep that sort of classic euro look. Oh and most likely a Brooks B66S in honey brown, with matching leather wraps and mud flaps.

Anyhow, back to gearing....I am just trying to make this a nice 'lazy day' rider for my wife. She has her Jamis Eclipse for more serious riding.

Thanks again all for the suggestions and knowledge shared.

Joe

JPZ66

Very sharp looking Peugeot !

If you remember, what stem is that ? Height and reach look about what I'm after. Oh, and she won't see this until it's finished so I have to base my settings on what I know and will perhaps have to make minor adjustments after the fact. Not a big problem...plenty of stems and seat posts and other bits in the workshop if needed.

Joe

JPZ66

The Gimondi track crank is on my radar too, but now I wonder how much a difference would be between 46t and 42, as it is only avail in the 46 and 48 ring. 46 may be better with the 26" rims vs the 700 ?

Thanks for posting those,

Joe

ColonelJLloyd 

No, the gearing won't change that much between 26" and 700c wheels, but enough a one tooth difference in the cog would be discernible.

Those pics of mom's Peugeot were taken before she'd ridden it. I raised the seat, installed a cog with one more tooth, installed the arm and pulley wheel thingy for the hub to improve the shifting and changed the headlight. You have to start somewhere and your plan sounds like a good one.

I believe that's the original stem. The reach is probably ~110mm.

JPZ66

Thanks Col ! Glad to know more details and that I'm on the right track with this.

Joe

Grand Bois

I use a T.A. 3 pin Professional crank on one of my IGH bikes. The bottom bracket is a Miche Primato track cartridge. Sorry, I don't remember the spindle length.

lostarchitect 

If you get one, be aware they use loctite on the chainring bolts. I rounded off a couple changing the chainrings. You need to heat them up first.

canyoneagle

The Gimondi has a 130mm Bolt Circle vs. the IRD Defiant's 144, so will be compatible with smaller sized chainrings. The limiting factor will be the IGH manufacturer's "input ratio" (front #teeth / Rear #teeth).
Both cranks offer bolt patterns that provide some options on chainring choice, so you are not necessarily limited to the # of teeth that come with the standard chain ring.

Chris_in_Miami

I've had my eye on that set for a 3-speed I'm building for my wife, I wonder if Electra is going to put them on sale again this year?

JPZ66

That would be nice if they did. First to know, be sure to post !

Joe

lostarchitect 

That would be cool-- I bought mine on sale last year. I took the chainring guard off, put a different chainring on, and it looks very old-school on my '79 Raleigh Competition with a 5-speed Sturmey IGH.