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Bicycles

Questions tagged [frames]

Bicycle frame construction, selection, maintenance, and repair.

558 questions
info Newest Frequent Votes Active Unanswered
2
votes
1answer
124 views

Rear wheel touch frame during off saddle sprint

bike: Cervelo S2 Photo wheels: Mavic Cosmic Pro Carbon (wheel is true) tyres: Continental Grand Prix 4000S II 23mm Problem is that during off saddle sprint my rear tyre touch the frame and makes ...
1
vote
0answers
46 views

Replace Viner Settanta seat post securing wedge

My seat post wedge has been removed. There seems to be loads of different styles and shapes depending on the make and model of frame. Does anybody know if any other makes will fit it as having trouble ...
-2
votes
2answers
117 views

Are my frame and fork straight?

I have been riding bikes and motorcycles since I can remember. Doing no hands is no problem, my question is with this particular generic bike frame that I built: I cannot do no-hands riding. Is the ...
1
vote
1answer
115 views

Frame with dent

I recently bought a bike and then realized it had a dent on the top tube. I would like to know your opinion if it is safe to ride. The bike is a Devinci Cameleon made from double butted aluminium. The ...
14
votes
3answers
7k views

Can I glue this crack as a temporary solution?

I suddenly noticed a crack in my frame. Is it practical for me to use glue to seal it off as a temporary solution? Edit: Further information ...two incidents so far. Someone opened their driver ...
10
votes
4answers
3k views

Banged frame: Is it still safe to use?

My girlfriend's bicycle was vandalized by a neighbour. It seems like they banged it with a hammer or something right in the middle of the frame. Is this still safe to use?
0
votes
0answers
53 views

Where to get replacement bike frame cable entry grommets?

Does anybody know where to get more of these ? These hold shift and/or brake cable ferrules where the cables enter the frame. Here is what they look on a bike if that helps: These specifically are ...
2
votes
0answers
102 views

Please help me identify this bike frame?

Please help me identify this bike frame for I am a newbie/novice. I will greatly apppreciate it. It appears similar to some 1950s Huffmans, but I am far from certain. Thanks to all in advance who ...
3
votes
2answers
136 views

Headtube dent, how safe is it?

See picture below, I am in this situation with a new alluminium frame (don't ask me how I ended up here, it's a heartbreaking story.) It’s a Cinelli Mash Parallax. The headtube has a dent and I don't ...
0
votes
2answers
108 views

How to judge grade of carbon frame?

Last weekend, a friend told me about a local bicycle shop(Metro Cycles) selling a Carbon Cycle of Hamilton brand. This brand is sort of known in India but only for cheap bicycles. Later I figured out ...
-5
votes
1answer
67 views

IS THIS BIKE SAFE [closed]

https://lh3.googleusercontent.com/S1PKL2uMXwJc2aGjGEybc8ZM4CFk-i5EHWrkZxLSVaD29xUrfIig1ap1dp6Na-WsjMc-Tw=s85 I M LOOKING TO BUY THIS BIKE AND I WOUD LIKE TO KNOW IF IT IS SAFE TO RIDE
1
vote
0answers
106 views

Identifying a brazed steel frame

I'm trying to identify this brazed steel frame I came across. Any help would be greatly appreciated.
0
votes
2answers
71 views

Correct Frame Size Trekking Short Legs

There seem to be two heuristics for determining frame size without testing a bike: inner leg length and body height. I have an inner leg length of 85cm and a body height of 192. According to my inner ...
3
votes
0answers
167 views

Please Help me identify my Bike Logo

Hello can someone help me identify my bike Frame?. It has this weird Logo and a Serial number of : "2948" . It has Suntour Dropouts likely NJS. Thanks!
23
votes
4answers
3k views

Can road bumps excite frame eigen frequencies?

During my last bike holiday I have happened to ride downwhill on roads which had transversal stripes to mark the approaching of a turn. The stripes were made with road paint, and were slightly higher ...
4
votes
5answers
340 views

Is there any reason for the rear frame and bottom bracket to be asymmetric?

I just received a new non-brand carbon frame and immediately noticed that the bottom bracket looks to stick out significantly more to one side than the other, and the rear bottom forks also seem to be ...
1
vote
3answers
154 views

Riding wrong size frame

I’m riding Trek Domane 4.3 2015. According to my height (165 cms) I should be riding 52 frame size(according to Trek size chart). The current bike my riding is 54. The only modification I have done is ...
2
votes
2answers
497 views

Time trial carbon frame scratches. Should I concern?

While cleaning my time trial bike I've noticed many scratches in the frame. See pictures below. My tire pressure is usually around 100 psi, depending on the weather conditions or circuit. My wheels ...
1
vote
1answer
133 views

Paint scratch or carbon crack?

I might just be overly paranoid, but does the line in the image (to the left of the glare) look like a paint scratch or could it be a sign of a spreading crack?
-1
votes
1answer
60 views

What frame is 20" bike

It's the frame from a box bike stamped where the rear wheel goes on I don't know the logo.
3
votes
1answer
110 views

Identify bike brand to fit gear hanger!

I have bought a new used bike, I got it very cheap since it was pretty broken up. I have replaced most of the parts and repainted the bike so it looks fine. The only thing I have a problem with is the ...
3
votes
2answers
224 views

Is it safe to ride this frame?

I don't have a clue what happened… Got the frame this way. Mountain bike is Lapierre Zesty 2014.
6
votes
2answers
193 views

Where did I go wrong with this frame painting procedure?

I just painted a bike frame (steel) with the steps outline below. However, every glancing contact with a rough surface immediately strips paint from the frame and I can see the metal shining through. ...
7
votes
4answers
3k views

Bending back a bent head tube - is it worth trying?

I have a bike that was in a major front end collision (I T-boned a car). The frame is steel and the bike bent at the head tube, the welds seem to be fine. Pictures below. I am fully aware the ...
0
votes
1answer
126 views

How do manufacturers designate women specific designs on their bicycles?

Is there a tell-tale sticker or serial number code that can be parsed to tell if a frame is intended for men or women? Basically, can I take a serial number sticker and lookup somehow what physical ...
1
vote
2answers
116 views

Mild pain in lower forearms during biking

I feel some pressure and fatigue in my wrists and lower forearms during riding but not after it. I don't know whether it is due to weakness of my wrists or my suspicion that my 18" frame mount bike is ...
3
votes
3answers
103 views

Regaining frame aligment

I bought a belt driven bike which had had the rear triangle of the frame moderately bent (i.e. bent but no tubes collapsed or cracked) – it was a gamble as to whether it’s fixable…. It has a Nuvinci ...
0
votes
1answer
88 views

Correct frame bike for me

I’m trying to measure a cyclocross bike. I’m 172 cm, leg length 77.5cm. Some websites like ebicycles say that my bike frame size is 53cm. I’m already looking for this bike with seat tube 54cm. A ...
1
vote
0answers
175 views

BMX frame logo identification

I have a BMX frame with a stylised "h" on the rear forks. Can anyone ID it for me?
2
votes
1answer
129 views

Please Assist in Identifying This Frame!

I ran across this site and thought someone may be able to easily identify this vintage racer. My neighbor passed and left it to me and I was hoping to at least know what it was. He worked on bikes for ...
2
votes
3answers
139 views

Is it cheaper to mass produce a carbon frame than an aluminium frame?

I've heard this comment but I have not found any information about it. Is it true?
1
vote
1answer
124 views

Are bike frames galvanized

I'm sorry for the stupid question, but I have a primer that works on steel but specifically says to avoid galvanized metals. I don't really know how to tell if a metal is galvanized or what use-cases ...
6
votes
3answers
178 views

The Effects of Widening Seat/Chainstays

first time so bear with me please. I recently had to replace my rear wheel. Went to LBS and the only options available are 130mm spaced. I have a nice Specialized 1980s frame that measures 126mm. It's ...
0
votes
1answer
126 views

How can I fit this bottle holder to this bike?

I want to fit this bottle holder on my bike but the attachment seems too thin for the frame tubes. I believe this is a universal bottle holder and my bike isn’t of unusual size or tube girth. Am I ...
4
votes
1answer
237 views

Are these extra holes on the frame for disc brakes?

My mtb (SERIOUS Rockville), which currently has rim brakes, has these holes at the back of the frame and I am trying to understand their use. Are these for disc brakes? Are these for disc brake ...
1
vote
2answers
277 views

Are bicycle serial numbers no longer stamped into the frame?

I found this bike ad which detailed the serial number of the bicycle for sale. I was surprised to see its simply a sticker which is far from the indelible stamped digits and letters on frames I'd seen ...
2
votes
1answer
194 views

Installing modern Deraileurs in an Old type mountain bike Frame

Found my old mountainbike(steelframe) and i saw that its Rear Deraileur was worn out, was wondering would i be able to install a modern deraileur on a bike frame like this? I'd also like to ask if ...
3
votes
1answer
118 views

How to evaluate different alloy types used for bicycle frames?

Only certain alloys are used for bicycle frames besides other materials like carbon fibres (at least for the mass market). I often stumble over aluminium alloy 6061 and 7005 (and I think I saw 8004 ...
2
votes
2answers
391 views

Is it possible to fit a 36T chainring on a 34T frame?

I'm thinking of building a bike from scratch around a Commencal HT AM 2018 frame, which normally comes with a 32T front chainring (1x setup) and says it takes 34T max. However a 36T would be ideal for ...
1
vote
2answers
145 views

I am 1.7 m tall and bought a MTB with a frame that is 3-5 cm too big

The frame is 5 cm too big for me (in the length from seat to handles). I have major discomfort in my shoulders. After getting a shorter stem, the shoulders are 95% improved, but the "jewels" go dead ...
0
votes
1answer
137 views

I found this frame at a garage sale, and wanted to know if it was a GT frame if so what kind? The serial number I found on the bottom is GB06070827?

Bike frame I'm wanting to build if it would be worth my time.
1
vote
2answers
65 views

Bike measurements vs my measurements

I would like to buy a used Rose Pro DX Cross bike (model 2014 or 2015) and its size is listed as being ST-56 cm and TT - 54 cm. I'm 178 cm in height and my inseam length is 79 cm. Do you think it's ...
4
votes
1answer
311 views

Titanium frame crack

I have a one inch crack in the topside centre of my top tube in my Ti bike. Is this a problem in terms of frame integrity or? Is it fixable? The bike was hand built by a local well known frame builder,...
1
vote
1answer
52 views

What tool do I need to press fit a “Spanish” bottom bracket?

I bought a BMX style bottom bracket called a "Spanish" bottom bracket for a dirt jumper. Instead of using a hammer and a block of wood, I would like to do it correctly with a press... however, I'm ...
7
votes
1answer
2k views

Bike comes with frame integrated bolt seatpost clamp - can I cut it off and use QR?

I've got a Marin Pine Mountain 1 2016 - it comes with a frame integrated bolt seatpost clamp. Is it possible to cut this off and use a QR seatpost clamp instead? Bike : Seat Clamp :
1
vote
2answers
42 views

What size frame is right for me? [closed]

I have an inseam of around 26 1/2 inches (without shoes). Would a 47cm frame fit me? If not what would the correct frame size be? I'm looking for a hybrid (or road) bike.
2
votes
1answer
111 views

Good fit vs. Best fit - Lower end of the fit range (Difference of 1 cm). Is it OK? or can this tiny difference still cause pains?

I want to buy a second hand Trek Cronus (Gary Fischer Collection) bike (50cms) for my wife. I am getting a good deal on it. My wife's height is 156cms. As per the Trek Sizing chart, the range of rider ...
4
votes
3answers
95 views

Should I leave bolts in frame when I've removed component (mudguards for example)

I've just remove my mudguards from my Ti frame and as usual I have put the bolts back into the frame where the thread goes into a tube - for example in the chain-stay bridge and brake bridge. I used ...
3
votes
1answer
148 views

Should I put a downtube guard on my aluminium enduro bike?

I am about to purchase a new Whyte G170s mountain bike. It does not come with a downtube protector to protect from rock strikes. Although the frame is not carbon I am wondering whether I should buy a ...
2
votes
1answer
92 views

What do these headset specs mean?

I'm building this frame from the ground up: https://www.deitycomponents.com/cryptkeeper_frame.html The specs for the headset say: IS 52/40 Lower Bearing (Tapered Steerer) IS 52/30 Lower Bearing (...

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