# Draw a diamond bicycle frame in Aquarell: connect both triangle groups at the right nodes

Language: en
Canonical: [Draw a diamond bicycle frame in Aquarell: connect both triangle groups at the right nodes](<https://allluckly.cn/en/guides/aquarell-diamond-bicycle-frame-tube-junctions/>)
中文：[中文 HTML](<https://allluckly.cn/guides/aquarell-diamond-bicycle-frame-tube-junctions/>)
English: [English HTML](<https://allluckly.cn/en/guides/aquarell-diamond-bicycle-frame-tube-junctions/>)
Published: 2026-11-11T00:00:00+08:00
Modified: 2026-11-11T09:40:26+08:00
Author: Bison

Use a simplified side view to check head tube, seat tube, bottom bracket and rear axle; wheels are positioning guides.

English translation of the [Chinese original](<https://allluckly.cn/guides/aquarell-diamond-bicycle-frame-tube-junctions/>), translated on 2026-11-11. Original publication dates, attribution, code and version notes are retained.

The earlier spoke study concerned rims and hubs; this lesson concerns a conventional diamond frame. Round wheels cannot rescue an arbitrary star-shaped frame. Draw a simplified side view manually in Aquarell, locating wheels first and checking the tubes enclosing the main and rear triangle groups. This static illustration is not an assembly drawing, strength calculation or vehicle safety inspection.

## Place wheel centres and ground first

Use an approximately 1900×1200 px landscape canvas with pale beige-grey background, rear wheel left and front wheel right. Keep both in side view on one ground line. Begin with pale grey circles without spokes, clearly separated centres and a frame mainly between them toward the left. Separate sketch, guide wheels, frame, fork, accessories and shadow; use muted brick red for the frame. Check centre height and radius if wheel sizes differ accidentally rather than invoking perspective outside this chosen view. Layout and node proportions are illustrative, not model geometry, riding size or manufacturing data.

## Locate the main triangle’s three junction regions

Locate the bottom bracket forward and below the rear wheel centre, then angle the seat-tube axis upward slightly rearward. Put a short head tube behind and above the front wheel centre. Join upper seat tube to upper head tube with the top tube, lower head tube to bottom bracket with the down tube, and seat tube back to the bracket. Head-tube length means this is not a perfect zero-thickness mathematical triangle. Trace the enclosure and ensure no frame tube runs directly to the front axle. Add the distinct head-tube ends and bracket volume if kite-like rather than arbitrary crossing lines.

## Use the seat tube for the rear group

Run a seatstay from the upper seat-tube region to the left rear axle and a chainstay from the bottom bracket to that same axle. Together with the seat tube they enclose the rear triangle group. Establish the near members; a side view may overlap or reveal little of their far partners, without inventing extra wheels to display pairing. Do not connect seatstays to the front head tube or hang chainstays from the saddle. Check both stays reach the axle if the wheel looks detached. Stop visible members at their junction instead of extending through the hub. Simplify lines, not ownership of nodes.

## Connect the fork below the head tube to the front axle

Extend the fork below the head tube along its axis to the right front axle, allowing modest curvature without sprouting from mid top tube. Show the near blade clearly and little of the far one while fixing axle position. Temporarily colour the fork dark grey against the brick-red frame to inspect attachment and occlusion. Trace its front-axle endpoint if it reads as another down tube. Remove a false bottom-bracket-to-front-wheel link. This study shows static exterior relations, not steering bearings or handling inferred from fork angle.

## Give tubes thickness and junction boundaries

Expand guide lines into tubes: broader main members and slimmer rear stays, merging naturally at joints rather than all passing through one another. Suggest the bottom bracket with a small cylinder, optionally expose a short seatpost and retain the distinct short head tube. Inspect without chain or brake cables so black masses do not clog junctions. Add restrained sides and cylindrical shading if circuit-like; remove arbitrary bends and diameter jumps if branch-like. Tube widths organise the illustration, not real wall thickness or comparative frame strength.

## Add accessories only at verified connections

Attach saddle to seatpost, handlebar through the steering region above the head tube and crank to bottom bracket. One stationary crank side suffices; invent no pedal motion path. Keep pale rims and darker tyre edges without repeating the dense-spoke lesson. Add a chain only after locating front chainring and rear sprocket; otherwise label this a simplified version. Omit lock, bottle and bag rather than blocking the triangle negative spaces. If cluttered, return to two wheels, frame and fork to see whether those alone explain the form, without accessories concealing broken joints.

## Use negative spaces to reveal incorrect links

Inspect each enclosed main/rear negative space with background colour and trace its tube boundaries. No unexplained rear-axle-to-head-tube diagonal should cross the main region, and thick stays must not fill the rear space. Lower guide-wheel contrast and ensure frame connections remain legible, then restore tyres. Adjust nodes and tube widths if triangles disappear rather than forcing white patches into them. Remove nonessential accessories if labels alone explain the drawing. Ask another reader to locate bracket, rear axle and head tube, without calling recognition a real structural inspection.

## Save both junction sketch and finished side view

Keep junction-check and finished layers in the native project and inspect a separately opened PNG. Check shared ground, then trace endpoints of main tubes, rear stays and fork. Remove hidden duplicate lines causing extra crossings rather than genuine connections. A later oblique view needs new near/far stays and wheel ellipses, not a skewed side-view image passed off as perspective. Label the simplified diamond-frame still life and omitted accessories. Correct nodes and traceable spaces are the criteria, not assembly, repair or riding-safety advice based on drawn proportions.

## Related tutorials and sources

[Paint a bicycle wheel in Aquarell: align spokes, hub and rim in one ellipse](<https://allluckly.cn/en/guides/aquarell-bicycle-wheel-spokes/>); [Aquarell negative-space painting: reserve winter branches in the sky](<https://allluckly.cn/en/guides/aquarell-negative-space-branches/>).

Sources checked on 11 November 2026: the [official Aquarell App Store listing](<https://apps.apple.com/cn/app/id1591340577>) and [Apple Lookup](<https://itunes.apple.com/lookup?id=1591340577&country=cn>) show version 1.0.7, requiring iOS / iPadOS 15.0 or later. The drawing uses the publicly described brush, colour, layer and saving capabilities manually. Sizes, shapes and colours are practice suggestions; confirm controls against the installed version. Keep the native artwork for further editing and use PNG for previews. This batch does not claim step-by-step device testing.

Structural reference: the component diagram in [Trek’s original bicycle manual](<https://media.trekbikes.com/image/upload/TK_OwnersManual_EN_WEB_April2023.pdf#page=60>) identifies head/seat/top/down tubes and rear stays. Only names and positions inform this original simplification, without copying model geometry or performing maintenance procedures.