'Newb' - All my Mountains are Paved...

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TBerk
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Joined: Fri Aug 30, 2019 23:36 pm

'Newb' - All my Mountains are Paved...

Postby TBerk » Wed Sep 18, 2019 04:44 am

I'm just getting into Online Bike Forums after many years of campaigning a Trek and now a very used and partly rebuilt Rocky Mountain.

My biking involves City Curb and Pothole Jumping, On and Off the Bus' front rack, Over the shoulder to carry it up Train Steps and Escalators, & step-walking the granny-gear up some of the San Francisco Bay Area's finest hills and inclines.

My front gearing is a three-set, but I haven't yet counted teeth, front or back.
Front Derailleur is non-existent; I slapped a poor fitting one on just to help with the chain jumping off.
(That symptom is going to be the main reason why I'm here, more on that later.)

The Rear End is a (I think) a Freehub with the 7 speed cassette transplanted over from the 'could not be trued any more' back rim.

I'm being counseled that I have worn gears and it's time to swap old mech for new.

I had grand thoughts of upgrading to an 11 speed set up, but the rear rim is new and sturdy like I like it so-
sticking in the 7 speed arena for now.

The stuff I've been picking up lately is:

Thick-Thin is a thing,

only having one (or maybe just Two) front chain-rings ain't a bad idea,

and I really need a very large 1st gear on the back, Granny-gear for the Win.
Maybe even the first two back there being on the large side.

I'm going to try and participate here pretty regularly but right now i need to break out the metal ruler and the calipers and document just what I've got and have been taking for granted.

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steve_sordy
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Joined: Tue May 29, 2018 08:38 am

Re: 'Newb' - All my Mountains are Paved...

Postby steve_sordy » Wed Sep 18, 2019 07:18 am

Welcome to the Forum TBerk.
Let us know what gears (numbers of teeth) that you have on the front and rear and we'll be able to help you get the same or better gearing with fewer front rings.

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The Rookie
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Joined: Thu Apr 30, 2009 09:29 am

Re: 'Newb' - All my Mountains are Paved...

Postby The Rookie » Wed Sep 18, 2019 07:54 am

A narrow wide ring can only be used with 1x gearing, not two front rings.

You need to be sure if you have a freehub with a cassette at the back or a spin on freewheel.

Sunrace do some reasonably wide 7 speed cassettes
http://www.sunrace.com/en/products/detail/csm40

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steve_sordy
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Re: 'Newb' - All my Mountains are Paved...

Postby steve_sordy » Wed Sep 18, 2019 19:36 pm

The Rookie wrote:A narrow wide ring can only be used with 1x gearing, not two front rings.

............


So that's what he meant by "thick-thin is a thing". :)

TBerk
Posts: 8
Joined: Fri Aug 30, 2019 23:36 pm

Re: 'Newb' - All my Mountains are Paved...

Postby TBerk » Thu Sep 19, 2019 03:39 am

OK, I ran out of Daylight and 'still' I got my fingers greasy counting teeth... :)

So far I can report I have a Front Three Ring (circus) w/:

22/32/42 & I only got to counting the 1st Gear on the back as having 30 teeth.

The rear is indeed a hub w/ Splines (vs any kind of spinning-on type arrangement.)

I've only ever really looked at Rim circumference (26" vs 700mm- which is what I have btw, 700)
I'm hoping I have enough Derailleur to deal w/ a 32 or 34T 1st gear. I'd rather have a larger range in the back, even if I had to trade off from the current Three-rings up front to a Two Ring setup.

btw- Thx Rookie; I had no idea you had to do a Single Chain Ring to use thick/thin hardware.

PS- http://www.sunrace.com/en/products/detail/csm40 Ooooooh, 34T & it's Blacked Out too...

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JBA
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Re: 'Newb' - All my Mountains are Paved...

Postby JBA » Thu Sep 19, 2019 07:16 am

You don't need to count teeth. The number is stamped on each chain ring and cassette sprocket.

You can probably fit a single 32 or 34 tooth chain ring* and one of those Sunrace 7-speed cassettes without any problems. It's worth fitting new jockey wheels and chain while you are at it as everything is probably worn.

What bike are you talking about - model and year?

*Assuming the chain rings are removable on your chain set.
“Life has been unfaithful
And it all promised so so much”

Giant Trance 2 27.5 2016 ¦ Bird Zero Mk1 ¦ Giant Revolt Advanced 2 2019 ¦ Giant Defy 1 2015
Giant Anthem 3 2015 ¦ Specialized Myka Comp FSR 2009

TBerk
Posts: 8
Joined: Fri Aug 30, 2019 23:36 pm

Re: 'Newb' - All my Mountains are Paved...

Postby TBerk » Thu Sep 19, 2019 16:00 pm

I have the weekend coming up where I plan on cleaning off the grime & taking some pictures, etc.

btw- it's a Rocky Mountain, year unknown. The frame was on the way to the Recyclers when I salvaged it.

The Front Shocks grew a stress fracture over time; replaced them w/ a fixed fork for now.

Rear Derailleur Drop-down stripped out after getting my rear rim 'tacoed' by a car leaving a parking lot so I'm using a simpler Shimano over-the-axle unit. That drop-down (correct term?) - edit - Hanger Is modular though so I have expectations of finding a replacement...

I picked up a set of front combo shifter/brake levers recently. They too are Shimano & 7 speed, (pretty sure SIS but model # is forthcoming).
Last edited by TBerk on Thu Sep 19, 2019 16:08 pm, edited 2 times in total.

TBerk
Posts: 8
Joined: Fri Aug 30, 2019 23:36 pm

Re: 'Newb' - All my Mountains are Paved...

Postby TBerk » Thu Sep 19, 2019 16:02 pm

Oh, and the Front Crank is using 4 arm spider but I need to investigate if the chain-rings are bonded on or interchangeable...

TBerk
Posts: 8
Joined: Fri Aug 30, 2019 23:36 pm

Re: 'Newb' - All my Mountains are Paved...

Postby TBerk » Thu Oct 03, 2019 23:45 pm

https://drive.google.com/file/d/1QHO6rJ ... sp=sharing

https://drive.google.com/file/d/1VTPobh ... sp=sharing

I'm having 'fun' w/ Google Drive, But those links are for the Rear D., and front left shifter/brake mech..


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