Questions tagged [frames]

Bicycle frame construction, selection, maintenance, and repair.

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Wear marks on seat stay from fender/mudguard. Problem?

Mudguards have worn away where they contact the seat stay on carbon frame. A little deep, wondering if cosmetic or more serious. The one on the right stay doesn't look as deep but you can see 3 ...
olivercroke's user avatar
14 votes
2 answers
2k views

I need help identifying this "Mystery Bike" (could possibly be a real ferrari?)

Good day to everyone, So i have this really old bike. I don't know its brand and model. The paint is still stock, and it has a Ferrari sticker with the name "Michael Schumacher" and ...
Anni's user avatar
  • 163
1 vote
1 answer
81 views

Carbon frame damaged? [duplicate]

I had a crash a couple of weeks ago with my BH Quartz. The front wheel got caught in a crack in the road, I heard a crack and I fell on the side. I was worried that the frame cracked, but couldn't ...
hagi10's user avatar
  • 11
2 votes
1 answer
523 views

On WSD bicycle shouldn't the seat tube be longer and at a shallower angle?

I bought a WSD ("Women specify design") bicycle for my wife which was delivered in a box. After putting it together I took it for a ride to test it and I realised two things. The seat tube ...
MindDBike's user avatar
  • 121
1 vote
2 answers
149 views

bike fork spacer(?)

hi im trying to pack my bike for an plane ride, and while packing I wanted to know what's the name of the spacer that comes between the fork to prevent compression without the wheel. its the thing ...
Jas0n's user avatar
  • 67
2 votes
2 answers
208 views

Are these scratches in my aluminum frame structural or purely cosmetic?

My aluminum bike (Cannondale Adventure 1) was scratched on the welds connecting the seat tube and seat stays, and I was wondering if the damage is purely cosmetic, or if there is any structural damage....
Peachy's user avatar
  • 106
0 votes
1 answer
149 views

Is this a serious paint defect?

I am about to receive a bike and the shop has informed me of the following (cosmetic, they claim) paint defect: Since I don't have a lot of experience, is this something that might chip off? Or is ...
AJA's user avatar
  • 11
-3 votes
1 answer
89 views

Cassette Compatibility Issues [closed]

Because I sit at home playing games in doodle jump too much, I decided to buy a bicycle to exercise.
damagevirtuous's user avatar
2 votes
2 answers
129 views

Vintage 531 frame. Identify original make?

I rescued this bike from the tip a couple of years back and rebuilt it (in the UK). I am curious to know what the original make might be? The original frame had been badly repainted so no makers name ...
MiguelH's user avatar
  • 241
1 vote
1 answer
116 views

Another carbon damage assessment?

Mostly cosmetic? Chip is located on the bottom of the top tube. Did it go through a layer of carbon, or is that just paint/resin? Dime sized. This is an enduro mtb frame, so assuming it's built ...
levbec's user avatar
  • 11
1 vote
0 answers
82 views

What model is this Dyno? Serial number makes it 1995 Nitro? VFR?

All stamped Dyno, white chainwheel, forks, stem, and bars. Cant find another like it, wondering if parts may have been swapped out at some point because I cant find this colorway anywhere, the ...
P Gilbert's user avatar
1 vote
1 answer
48 views

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 ...
A.D.'s user avatar
  • 111
0 votes
2 answers
70 views

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.
Bobby magee's user avatar
-4 votes
1 answer
88 views

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 ...
cocobutters's user avatar
1 vote
0 answers
39 views

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
Sellinyey FPV's user avatar
4 votes
1 answer
117 views

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?
JohnnyFromBF's user avatar
4 votes
1 answer
199 views

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 ...
Art Gertner's user avatar
  • 2,254
0 votes
1 answer
161 views

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 ...
TommyYOyoyo's user avatar
0 votes
1 answer
51 views

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
a_h's user avatar
  • 1
0 votes
0 answers
34 views

Help me decode Haro Vector serial number please

Recently acquired a Haro Vector mountain bike. Serial number V2K506004 anyone please help me decode this?
Josh Reedy's user avatar
6 votes
2 answers
1k views

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 ...
Aivaras Poška's user avatar
4 votes
1 answer
75 views

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 ...
Samitha Niduwara Bandara's user avatar
1 vote
1 answer
75 views

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 ...
Daniel's user avatar
  • 153
3 votes
2 answers
159 views

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 ...
roverhendrix's user avatar
17 votes
5 answers
2k views

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 ...
Maik Lowrey's user avatar
3 votes
1 answer
177 views

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?
Maik Lowrey's user avatar
-2 votes
1 answer
189 views

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 ...
JØKËR's user avatar
5 votes
1 answer
843 views

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?
Nayuki's user avatar
  • 153
0 votes
2 answers
107 views

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.
Boniface munene's user avatar
2 votes
2 answers
621 views

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
tweedi's user avatar
  • 493
3 votes
4 answers
2k views

Were titanium road bikes ridden in the Tour de France?

I know that steel and aluminium frames were ridden in the Tour. I wonder if there was a time when titanium frames were ridden in the Tour de France. was ridden. I haven't found anything about this on ...
Maik Lowrey's user avatar
0 votes
1 answer
102 views

What's bike do I have

I can't find what kind of bike I have and I can't find the logo anywhere on the internet I've googled image and it's not on there please help me and tell me what I have thank you
Tophertime69's user avatar
8 votes
2 answers
3k views

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 ...
whyte22's user avatar
  • 89
0 votes
0 answers
79 views

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 ...
FlareCas.'s user avatar
4 votes
1 answer
127 views

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 ...
tweedi's user avatar
  • 493
14 votes
3 answers
2k views

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 ...
Apfelsaft's user avatar
  • 371
2 votes
0 answers
103 views

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 ...
Khen Fernandez's user avatar
10 votes
1 answer
1k views

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, ...
Robert's user avatar
  • 2,051
5 votes
4 answers
928 views

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 ...
Gregory Leo's user avatar
  • 1,295
13 votes
2 answers
3k views

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. ...
Robert's user avatar
  • 2,051
6 votes
1 answer
212 views

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?
Maik Lowrey's user avatar
9 votes
4 answers
2k views

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. ...
Maik Lowrey's user avatar
1 vote
1 answer
120 views

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 ...
Karpuz's user avatar
  • 11
2 votes
2 answers
140 views

Help identifying bike make and model

Can anyone help me please in identifying my racing bike frame make and model? I can’t find any serial numbers or markings on the frame and I am not even sure whether it is in fact a Gios Torino frame ...
Simon Dingle's user avatar
2 votes
1 answer
87 views

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 ...
Ted Burgess's user avatar
0 votes
0 answers
27 views

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?
Jody Brennan's user avatar
13 votes
5 answers
3k views

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 ...
Kevin Weckbach's user avatar
8 votes
6 answers
2k views

Is it possible to repair a dent on an aluminum frame using carbon fiber?

Every dent is unique so I think it is ok to ask this question once more. I have a Stevens Superflight 2020 which has a dent on a frame: My plan is to create some carbon fiber sleeve around the dent, ...
Євген Волощенко's user avatar
2 votes
3 answers
165 views

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—...
Sam7919's user avatar
  • 8,974
7 votes
2 answers
752 views

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 ...
Will Vousden's user avatar
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