iFixit - Answers With Device "Bicycle"

Electra: 后轮更换内胎

Thu, 13 Nov 2025 20:30:26 -0700

后轮更换内胎应该如何拆解

⟐ Commented 十一月 13, 2025 at 20:30 GMT-7

Brompton: 如何成功改装带有主题系列的Brompton折叠车？

Mon, 22 Sep 2025 08:48:18 -0700

给出具体的涉及到的设计工具以及如何评估和采买对应的改装配件？

最好是可以给出具体的示例。

如图所示，有一个类似改装成一个高达系列的主体Brompton。

那如果我要改装成一个蝙蝠侠系列呢？小丑系列呢？我该如何做到审美与实用兼具的改装效果呢？

⟐ Edited by author 九月 22, 2025 at 8:48 GMT-7

Brompton: Brompton 如何拆解、组装、日常维护

Wed, 19 Mar 2025 21:29:53 -0700

如何拆解、组装、维护，需要哪些工具和注意事项?

Bicycle: How do I straighten a bent wheel rim?

Fri, 05 Jun 2020 10:18:30 -0700

One of the rims on my bike is very bent; it stops after 1/2 a revolution because the bent part hits the brake pads.

I've heard that I need a spoke key, and also read that the best way to get a rim straight is to just take it to a pro, since it is somewhat of an art. Is this something I can tackle on my own?

⟐ Commented 六月 05, 2020 at 10:18 GMT-7

MiJia QiCycle Folding Electric Bike: My Qicycle suddenly has no power assist

Sat, 27 Dec 2025 16:20:40 -0700

The battery level shows it is full and the LCD display shows up normal. Now it is just an ordinary bike with no power assist. The LCD display still shows the speed and watts of the bike when I am padel the bike. The bike has only 150km. Which component I should replace first or how to narrow down the faulty unit? Bike Control unit, torque sensor or the motor?

⟐ Answered 十二月 27, 2025 at 16:20 GMT-7

MiJia QiCycle Folding Electric Bike: Can't charge anymore the battery

Tue, 30 Dec 2025 22:04:34 -0700

Hello,

I’ve just bought the Xiaimo QiCycle bike, and I was so happy of my purchase.

I’ve ride it to my work for a few time before winter, and I put it in the garage waiting for better days.

The sun comes finaly earlier, and when i tried to charge the battery, nothing works…

I noticed that once connected to the charger, the green led of the charger did not turn red (charging indicator), while the indicator of the bike tells me that it is completely discharged

This green led stay to green, and do not charge the battery:(

Could you tell me what to do to find out if the problem is with the charger or the battery?

Thanks a lot for your responses !

⟐ Commented 十二月 30, 2025 at 22:04 GMT-7

MiJia QiCycle Folding Electric Bike: How change 20km/h Speed Limit

Tue, 30 Apr 2024 13:58:05 -0700

Hi,

I've a Xiaomi QiCycle and when the bike reaches 20km/h the board stops powering the engine....

Somebody knows how remove/bypass/change this software limit?

Here more details:

米家骑记电助力折叠自行车拆解

⟐ Answered 四月 30, 2024 at 13:58 GMT-7

Bicycle: How can I tell if my derailleur hanger is bent?

Wed, 12 Apr 2023 04:14:11 -0700

Should the jockey pulleys be directly aligned with the gear (cassette) cog?

⟐ Answered 四月 12, 2023 at 4:14 GMT-7

MiJia QiCycle Folding Electric Bike: Translate the display in another lenguage

Sun, 14 Oct 2018 06:23:53 -0700

Does anyone know how to translate the display into Chinese in any other language; Spanish, French English ...

⟐ Commented 十月 14, 2018 at 6:23 GMT-7

Bicycle: How do I convert my road bike to a fixed gear?

Thu, 19 Jun 2025 13:58:54 -0700

This has been answered on the internet in various other places, but I am new to bike repair and modification. The things I have read are geared towards people who seem to know bike parts well. With the exception of my most recent bike, every bike I have ever owned were fixed gears. I got a used road bike specifically to practice working on it and eventually converting it.

That being said, what is the best way to go about converting it to a fixed gear? Like I said, I know next to nothing about the subject, so please feel free to over explain.

⟐ Commented 六月 19, 2025 at 13:58 GMT-7

MiJia QiCycle Folding Electric Bike: xiaomi qicycle battery replacement

Tue, 22 Nov 2022 07:38:10 -0700

where can i buy qicycle battery ? or how can i open the casing of the battery cause 18650 type is easy to find in my country.

⟐ Commented 十一月 22, 2022 at 7:38 GMT-7

MiJia QiCycle Folding Electric Bike: Can not switch on bike after a few weeks pause

Fri, 21 Nov 2025 18:07:51 -0700

Hi, I have not used my Qicycle for a few weeks. Now it can not be switched on anymore. The battery is fully charged (all LEDs are lit) but the display is dead. Does anyone have an idea where to start debugging? does anyone know the problem? I'm grateful for any hint!

⟐ Commented 十一月 21, 2025 at 18:07 GMT-7

Bicycle: Why does my bike change gears at random?

Fri, 29 Mar 2024 18:36:33 -0700

When riding my bike I have to constantly keep pressure on the shift trigger to keep my rear gears from switching. If I try to ride it normally without having my hand on the shifter then it will change gear at random, more often so when I pedal harder. This is a bit of a bother and is unpleasant while riding. I have tried to adjust the shifter cables and adjustment screws but to no avail. Any suggestions or thoughts would be of great help :)

⟐ Commented 三月 29, 2024 at 18:36 GMT-7

Bicycle: How do I repair the sound coming from the gears?

Fri, 03 Jun 2022 07:40:34 -0700

I do not know from which exact part of the gears is the sound coming....all i know is that when i shift into the first gear then the bike starts making some sound and does not change till i give it a shake.

⟐ Commented 六月 03, 2022 at 7:40 GMT-7

2006 Iron Horse Warrior: Why don't my brakes work?

Wed, 20 May 2015 19:24:21 -0700

No matter how hard I pull on the brakes, I can't stop

⟐ Answer accepted 五月 20, 2015 at 19:24 GMT-7

Bicycle: When pedaling, the back tire locks.

Sun, 24 Dec 2017 23:38:44 -0700

You start to pedal and it feeels as though you just braked forward. Back tire will not turn as though chain locked up

⟐ Answered 十二月 24, 2017 at 23:38 GMT-7

2006 Iron Horse Warrior: Why isn't my bike shifting?

Tue, 12 May 2015 09:23:24 -0700

When I shift through my gears it won't switch to every gear. Sometimes it skips a gear or won't shift at all.

⟐ Answer accepted 五月 12, 2015 at 9:23 GMT-7

MiJia QiCycle Folding Electric Bike: Watt-meter display jumps and motor stops

Sun, 18 Aug 2019 08:44:12 -0700

Hi Guys,

The past 2-3 weeks I’m experiencing a problem with the electric bike.

The meter of Watts in the display has a lots of variation and while it might be at one moment 140 Watts, it can change to 200 Watts after a second without any reason (cycling with steady pace).

This results in stopping the motor even if I am under the limit of 25km/hr (kind of blocking it so it doesn’t give boost) as it is probably limited to going to a certain amount of max Watts.

The solution for the motor to keep giving boost is to stop the bike and start again from 0 Watts.

Any ideas on this/have you encountered something like this before? I’m trying to figure out what might cause the problem. It all started after I fell once with the bike.

⟐ Answered 八月 18, 2019 at 8:44 GMT-7

Bicycle: Frozen brake lines from rain

Tue, 26 May 2015 10:15:32 -0700

How do I keep brake lines from freezing? I have a Trek 7500 that has brake lines that freeze if water gets in the lines and temp drops below freezing. Have put teflon based lubricant on ends, put in warm basement, and they still freeze if all water is not out of lines. Help.

⟐ Answer accepted 五月 26, 2015 at 10:15 GMT-7

MiJia QiCycle Folding Electric Bike: Why battery is 100% but display show me 0%?

Tue, 08 Jun 2021 02:39:19 -0700

Hello,

I don't know why but suddenly my qicycle stops to work… The battery is charged but the display show me 0%.

I tried some solutions like disconnect and reconnect torque cable and try to update by official and unofficial app the firmware but It doesn’t work.

When I try to upgrade the firmware, the process failed every time and I tryed few times.

I don't know really how to solve the problem, please help me!

thank you very much!

⟐ Commented 六月 08, 2021 at 2:39 GMT-7