I only recently got into bicycling and without knowing anything, I bought a bike from a local used bike distributor.
Here's what I've learned about the bike.
- The frame, seat, and handles are original to the bike which is a Univega Alpina Uno.
- Somewhere along its life it had the wheels changed, and the cassette and derailleur were changed to go with it.
- The chain ring is 48/28 (48,38,28)
- The Cassette is 14/34 (14,17,20,24,28,32) Edited to indicate I had incorrectly counted my teeth on the smallest sprocket/cog thingy
- The Front rim is 26X1.75 and the back rim is is 26X1.5 but it came with 26X1.75 tires.
- The derailleur says suntour XC Sport 7000.
- The BCD is 110mm and the crank is 170mm.
- A friend looked at it and said "oh look you have a free-wheel" which didn't mean anything to me but seemed a relevant bit to pass along. My chainset says "Computer designed Bio Pace" on it which I think means it isn't a circle.
OK that's all the information I think I can provide.
Now for the problem.
In the stiffest gear on flat ground I am out-pedaling the bike. I don't know if there is an official term, someone said I was "topping out" but basically from what I gather my gear inches is not high enough. Articles I've read indicate that 11 to 50 from cassette to chainring is a good number to have, and I'm at 14 and 48.Edited to change 17 to 14 since I can't count
So what is the solution?
As I understand it I need to go smaller on the back and/or bigger on the front. But I haven't been able to figure out what is involved.
It seems like if I replace my crankset and my cassette I'll get what I want, but that is a lot of parts and will require a new front and real derailleur.
I learned that the chainring can also be replaced independent of the rest and might be easier, but 48 is already pretty close to the 50,52 that I'm seeing as more common. So it might not be helpful.
I don't want to buy a whole new bike worth of parts, but it is starting to feel like that is what I am needing to do. Is there something I missed?
Edited to add pictures; Here is a google album of the pictures I've taken to help illustrate the situation. Hopefully they match up to the description I've given so far. https://photos.app.goo.gl/CPcJu4fdb8Z2i39J8
I used my calipers to measure the space between the inside mounting points of the frame and I came up with 126mm. The outside measures 139mm. But from what I've read common sizes are 130mm and up for the distance on the inside of the fork(?) so 126 is odd, but it would explain the extra spacers I see on the threaded shaft that goes through it.