Questions tagged [frames]
Bicycle frame construction, selection, maintenance, and repair.
941
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Challenge Seiran luggage rack image or blueprint
Years ago, I bought a Challenge Seiran. At the time, I didn't bother buying the luggage rack attachment. Not the one attached behind the seat but the one going under it.
For those who don't know, it ...
- 124k
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4
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Should I Get the Paint Job Touched Up
My wife's bike recently got scraped up and the paint got scratched down to the frame. It's an alloy frame. Should she be concerned about rust or any kind of damage? If so, do we need to get it ...
- 1,202
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What size of inner tube fits a 650x47b tire?
What size of inner tube fits a 650x47b tire?
It's gravel bike. The tire states it's tubeless ready but there's a tube in it currently.
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Is it possible to prove that applied forces to a top tube are worse than a seatpost when using a repair stand clamp?
This stems from the idea that you should use a bike stand clamp on a seatpost, if you can, for carbon fiber (CF) bike frames. Hopefully, this would avoid the cracking of a CF bike frame.
In order to ...
- 85.2k
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Need help identifying this logo on 2016 bmx
I was looking for a bit of help identifying this insignia on this 2016 bmx I'm restoring. Any help would be fantastic
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Which geometry specifications determine the seating position of an MTB?
MTB manufacturers release geometry data for their bikes. If I want to know if a bike has a more upright or stretched position, which geometry data do I have to compare?
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Were older bikes generally longer?
Tl;dr: Were bicycle frames in the mid-20th century generally longer than today?
This post asked about the length of a Soviet bike from the 1980s. The frame is longer than that of a contemporary bike ...
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Aluminium frame alterations
I know it is possible to make almost any type of frame alteration to a steel frame. But what about aluminium?
I would like to know if anyone has a first-hand experience in adding braze-ons, and doing ...
- 124k
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Tiny dent near the bottom bracket of a new hardtail - should I be concerned?
I’ve just purchased a new Trek Roscoe 7 (aluminum hardtail mountain bike) recently and I’ve noticed this tiny little dent today. It is on the drive-side chainstay near the bottom bracket.
Should I ...
- 5,135
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What do these specs mean? I have a Cannondale Road Bike 700x23c
I've been trying to find the model of my bike but I can't even find the year.
700x23c
175
EPE 45% PU 55%
T 430
700
23-622
- 124k
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Help me decode Haro Vector serial number please
Recently acquired a Haro Vector mountain bike. Serial number V2K506004 anyone please help me decode this?
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How to adapt a tube-mounted clamped accessory for a larger diameter tube?
I bought an Abus bike lock which came with a tube mount called the Abus EaZy KF.
The issue is that this mount only supports up to 36 mm diameter tube but the smallest tube on my bicycle is 38 mm. I ...
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Small dents on bicycle frame
Two weeks ago I bought Trek Checkpoint ALR5. Bike rides pretty well. It has aluminium frame. I bought it primarily for bike packing trips as it has ton of mounting points.
After riding it for 2 weeks ...
- 124k
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Carbon Damage on bridge, repair possible? If so, what steps are needed?
This is a follow up question to:
Attachmentpoint rim brakes carbon bike, sratches/crack?
So. My bridge on my x lite 4 seems to be delaminating. Unfortunately Rose does not want to honor their six year ...
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Stainless steel ladies bike frame failure?
i am new to this group and this is my first post. My Japanese Miyata ladies bike had this problem for so long time. The down tube had come out for about 3mm from its connecter. It looks like there ...
- 31.5k
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Is the carbon frame disposal problematic
I heard from someone that carbon is difficult to dispose of. Does anyone know how
to dispose of carbon frames?
- 31.5k
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Which frame material is the most sustainable?
I would like to buy a new road bike. However, I also want to make sure which material is the most sustainable. On the one hand in production and on the other hand in disposal.
I had already asked a ...
CommunityBot
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I don't understand why these bikes have the specific frame sizes
Why does huffy's Rock Creek mountain bike have the same size frame for the 26-in and the 24-in but the 29-in version has a huge frame like a 26-in mountain bike should not have the same size frame as ...
- 21.3k
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Identify unusual thin bicycle frame
What is the generic name and/or specific products associated with the illustrated frame? Is it lighter than a normal frame?
- 58.9k
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What color can I spray on top my green bike?
I want to do this without having to remove/strip having to strip paint from the frame which is already flaking off slowly.
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Is there an issue with this seatstay? photo
is this seat stay normal or is there a dent / damage here?
Hard to tell it's near the welding but the other side does not have this.
From https://imgur.com/a/xUtmeKN
- 124k
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Carbon Specialized Sirrus X5.0 Help
I am very new to this thread and seeking help from an experienced bike enthusiast. I just purchased the aforementioned bike in the title and after bringing it home for inspection (bought brand new ...
- 6,142
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Do carbon MTB frames crack easily?
I have been looking to buy a new full sus mtb (Vitus sommet 29 Cr) and saw that the main frame is carbon fibre with the rear triangle being aluminium. I love the bikes specs and aesthetics but can't ...
- 15.5k
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Help identify BMX please - possibly 80s or early 90s
I recently picked up this old BMX bike for AU$5 at a garage sale. I was originally only interested in the Skyway Turbo Disc chain wheel, but decided I would strip the whole thing and give it a new ...
- 124k
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Why is carbon fiber inherently weak? Or is it?
This question got me to thinking: If it were possible for me to use a carbon frame, I would, but the expense and my riding style keep me using steel and aluminum. (I like hauling stuff on racks and I'...
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Identifying this road bike brand
Can someone help me identify this frame? It was given to me in Switzerland. My uncle and cousin bought it already painted grey. I noticed an engraved logo in the dropout, but it does not look like it ...
- 4,119
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Help identifying frame brand/model
My friend gave me this frame and the old paint job was covered with spray paint so I decided to paint, strip and run it raw.
I need help with identifying the frame. The pictures provided show the ...
- 4,119
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Why do most full suspension MTBs have a kink in the down tube?
Back in the time... bikes did not have (rear) suspension and the most common frame design was the "diamond frame", with straight pipes. Today, mostly in full suspension bikes, there is ...
- 124k
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Butted tubing - lighter but is it more fragile (child seat)
Looking to build a daily on a steel frame, tempted to go for a higher end (Marin, Kona, some Raleigh) but I am wondering if the double or triple butted tubes are more fragile ?
For example if you put ...
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BB drop vs BB height from stability perspective
While I have heard that a lower bottom bracket tends to give more stability, I'm confused as from which point of reference yields such an effect, from the wheel axle (BB drop) or from the tire contact ...
- 85.2k
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Why aren't derailleur hangers made into standard shapes?
That small piece of metal can render a bike unrideable, and sometimes a repacement is impossible to find.
There are standards for headsets, bottom brackets, brake mounting points, OLD and dropouts, ...
- 15.5k
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Rear wheels are dished. Why not "dish" the frame instead?
Most rear wheels are dished to make room for the cassette. They have the drive side spokes comming into the hub more perpendicularly, which weakens the wheel against lateral forces in that direction. ...
- 124k
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Is there a reason why it was said that the distance between the seat tube and the rear wheel should be as small as possible on a road bike?
I recently saw a steel road bike in a road bike shop where the distance was well over 1cm. 99.9% of old road bikes had a very small distance (~5mm). At the time, they thought it was more aerodynamic. ...
- 18.7k
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What is the advantage on road bikes where the seat stay merges into the upper part of the seat tube, but well below the top tube
For a few years now, you see more and more road bike manufacturers building this new frame shape. What is the advantage of this geometry?
- 18.3k
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How many years an aluminium frame lasts in a touring bike?
How long does an aluminium frame lasts in a touring bike?
[Removed extra questions to be clear.]
Background
So far I preferred aluminium vs. steel for many reasons, but if steel lasts significantly ...
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Is this defect on 2022 Trek FX 2 frame?
I got new 2022 Trek FX 2 couple of days ago. But I noticed something on the end of the left chain stay. Are these defect and should I worry about it? Also I asked this to the local retail where I ...
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Bent Reynolds 531 Simplex stays at dropouts
I have just bought a Reynolds 531 Simplex bike frame and noticed the left chainstay and right seatstay look slightly bent at the dropouts. The right dropout appears to be incompletely inserted into ...
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Can I trust my bike’s frame after I was hit by a car if there's no visible cracking?
I was waiting at a red light and the person behind me hit me. Her car ran over my rear wheel crushing it and over my frame. I have checked the frame were there are indications of her car but do not ...
- 31.5k
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Getting information from a 15 Giant Avail Adv 1 Serial Number
My bike was totaled. I have the serial number from the original receipt. Can I find out the frame size of the bike with the serial number?
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Do inner-routed cables have segments without a housing?
Bowden cables (whether for shifting or for brakes) running outside a
frame save a little weight and expense by using the frame for
compression in lieu of the housing in long stretches along the
frame—...
- 20.2k
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Can I mount a rack on eyelets that aren't horizontal?
The eyelets at the lower end of my frame's seatstays are not aligned with the dropouts (to allow attachment of a vertical rack strut). The misalignment is around 13°.
Two questions:
What options do I ...
- 58.9k
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Can someone tell me what kind of bicycle this is? Also, how much would it be worth?
Can someone tell me the make, model, and value of this bicycle?
The logo on the front says IMPERIAL in white across a gold (or silver?) band over a black circle with four gold crowns in an arch across ...
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Good idea to arbitrage this frame?
I came across a FB marketplace listing where the seller is having a quick sale of an alleged carbon fiber Opus Andante frame due to a move. He supposedly live in a wealthy area of town, originally ...
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Carbon damage to frame after sideway fall
Today, I went out for a ride and had a small crash. I fell down sideways, then came home and realized there’s a small paint chip (which i’m fine with it) but there’s a small dot which is the deeper ...
- 124k
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Front derailleur clamp/hanger for Rivendell frame
I am building a bike with a Rivendell custom frameset. The seat tube size is 29.7mm. I am mounting a Dura-Ace FD-R9150 front derailleur that is braze-on.
I'm looking for an adapter clamp but the ...
- 85.2k
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Help identify this very old bike frame
Few days ago I got as a present one very old bike frame which was almost completely stripped of paint few years ago and slight rust got on it on the surface. Only fork was in it’s original color, it ...
- 21.3k
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About "Auto-Mini" folding bikes: Can you use one for decades without having to replace the frame?
I've been thinking of buying an internally-geared folding bike for commuting (5 km each way) and errands. I want to spend $100-$200, but I want a reasonable-quality frame; I don't want to ever have to ...
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Help identifying make of steel elevated chain stay mountain bike frame
Could anyone tell me what is the make or model of this bike there are no visible numbers or name except for this sticker of the maker of the seat tube.
I appreciate all the help. you guys know your ...
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Bike identification
I am trying to identify this bike.
It has a club cutout in lugs and 4 card suits on inside of fork crown. Frame's serial number is 75390.
Also has direct frame mount above rim mafac Brake bosses. ...
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YEAR/MODEL Technique BMX frame
I own this Technique BMX frame and need help determining which frame i own. Serial number is M12903.
serial number underneath right rear fork
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